CmdPal: Fix a line-break in RDC extension error toasts (#44129)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

This PR fixes a line break in the RDC extension toast message, replacing
unescaped \r with a new line (\r in the XML is not recognized as a new
line escape sequence).

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## PR Checklist

- [ ] Closes: #xxx
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issues) -->
- [ ] **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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## Detailed Description of the Pull Request / Additional comments

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## Validation Steps Performed

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.RemoteDesktop/Properties/Resources.Designer.cs

@@ -19,7 +19,7 @@ namespace Microsoft.CmdPal.Ext.RemoteDesktop.Properties {
     // class via a tool like ResGen or Visual Studio.
     // To add or remove a member, edit your .ResX file then rerun ResGen
     // with the /str option, or rebuild your VS project.
-    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "17.0.0.0")]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "18.0.0.0")]
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
     [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
     public class Resources {
@@ -88,7 +88,8 @@ namespace Microsoft.CmdPal.Ext.RemoteDesktop.Properties {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Unable to initialize Microsoft Terminal Service Client. Ensure it is enabled in Windows Settings.\r{0}.
+        ///   Looks up a localized string similar to Unable to initialize Microsoft Terminal Service Client. Ensure it is enabled in Windows Settings.
+        ///{0}.
         /// </summary>
         public static string remotedesktop_log_mstsc_error {
             get {

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.RemoteDesktop/Properties/Resources.resx

@@ -142,7 +142,8 @@
     <value>A list of connections to include in the query results by default</value>
   </data>
   <data name="remotedesktop_log_mstsc_error" xml:space="preserve">
-    <value>Unable to initialize Microsoft Terminal Service Client. Ensure it is enabled in Windows Settings.\r{0}</value>
+    <value>Unable to initialize Microsoft Terminal Service Client. Ensure it is enabled in Windows Settings.
+{0}</value>
   </data>
   <data name="remotedesktop_log_invalid_hostname" xml:space="preserve">
     <value>The hostname '{0}' was invalid. Ensure you're using a valid hostname or IP address.</value>