Minor ZoomIt fixes (#43495)

## Summary of the Pull Request
Regarding #43265 / #43266, I noticed some minor spelling mistakes. I
also refactored some literal strings to string constants.

I didn't discuss this with core contributors or @MarioHewardt. Just a
quick shot-from-the-hip PR ;-) I hope that isn't a problem...

_Note: this is a new Pull Request for this change. I had to close the
previous one (#43443), because I had made a commit using a wrong Github
account._

## PR Checklist

- [ ] Closes: #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/ZoomIt/ZoomIt/Zoomit.cpp

@@ -1812,7 +1812,7 @@ INT_PTR CALLBACK OptionsTabProc( HWND hDlg, UINT message,
                 // Check if GIF is selected by comparing the text
                 bool isGifSelected = (wcscmp(selectedText, L"GIF") == 0);
 
-                // if gif is selected set the scaling to the g_recordScaleGIF value otherwise to the g_recordScaleMP4 value
+                // If GIF is selected, set the scaling to the g_RecordScalingGIF value; otherwise to the g_RecordScalingMP4 value
                 if (isGifSelected) {
                     g_RecordScaling = g_RecordScalingGIF;
 

src/settings-ui/Settings.UI/ViewModels/ZoomItViewModel.cs

@@ -24,6 +24,9 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 {
     public class ZoomItViewModel : Observable
     {
+        private const string FormatGif = "GIF";
+        private const string FormatMp4 = "MP4";
+
         private ISettingsUtils SettingsUtils { get; set; }
 
         private GeneralSettings GeneralSettingsConfig { get; set; }
@@ -656,12 +659,12 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
         {
             get
             {
-                if (_zoomItSettings.Properties.RecordFormat.Value == "GIF")
+                if (_zoomItSettings.Properties.RecordFormat.Value == FormatGif)
                 {
                     return 0;
                 }
 
-                if (_zoomItSettings.Properties.RecordFormat.Value == "MP4")
+                if (_zoomItSettings.Properties.RecordFormat.Value == FormatMp4)
                 {
                     return 1;
                 }
@@ -672,19 +675,19 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             set
             {
                 int format = 0;
-                if (_zoomItSettings.Properties.RecordFormat.Value == "GIF")
+                if (_zoomItSettings.Properties.RecordFormat.Value == FormatGif)
                 {
                     format = 0;
                 }
 
-                if (_zoomItSettings.Properties.RecordFormat.Value == "MP4")
+                if (_zoomItSettings.Properties.RecordFormat.Value == FormatMp4)
                 {
                     format = 1;
                 }
 
                 if (format != value)
                 {
-                    _zoomItSettings.Properties.RecordFormat.Value = value == 0 ? "GIF" : "MP4";
+                    _zoomItSettings.Properties.RecordFormat.Value = value == 0 ? FormatGif : FormatMp4;
                     OnPropertyChanged(nameof(RecordFormatIndex));
                     NotifySettingsChanged();