CmdPal: Change captitalization of "Last position" item (#43518)

## Summary of the Pull Request

This PR updates the capitalization of the drop-down item from "Last
Position" to "Last position" to align with the guidelines.

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- [ ] Closes: #xxx
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- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
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src/modules/cmdpal/Microsoft.CmdPal.UI/Strings/en-us/Resources.resw

@@ -429,7 +429,7 @@ Right-click to remove the key combination, thereby deactivating the shortcut.</v
     <value>More</value>
   </data>
   <data name="Run_Radio_Position_LastPosition.Content" xml:space="preserve">
-    <value>Last Position</value>
+    <value>Last position</value>
     <comment>Reopen the window where it was last closed</comment>
   </data>
   <data name="TrayMenu_Settings" xml:space="preserve">