CmdPal: Fix resource key name NavigationPaneClosed to match literal in code and prevent crash (#41361)

## Summary of the Pull Request

Corrects a mismatch between the resource key and the actual literal used
in code. The key was incorrectly named `NavigationPageOpened`; it now
correctly uses `NavigationPaneClosed`. Introduced in #41016.


## PR Checklist

- [x] Closes: #41362
- [ ] **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/Microsoft.CmdPal.UI/Strings/en-us/Resources.resw

@@ -438,7 +438,7 @@ Right-click to remove the key combination, thereby deactivating the shortcut.</v
   <data name="NavigationPaneClosed" xml:space="preserve">
     <value>Navigation pane closed</value>
   </data>
-  <data name="NavigationPageOpened" xml:space="preserve">
+  <data name="NavigationPaneOpened" xml:space="preserve">
     <value>Navigation page opened</value>
   </data>
 </root>