Set focus to the search box when the app is loaded

[AndrewKeepCoding]

This PR sets the focus to the search box in the title bar when the app is loaded.
Closes CommunityToolkit/Windows#651.

[AndrewKeepCoding]

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[Arlodotexe]

Tested locally, seems to work as expected. Thanks for your contribution here @AndrewKeepCoding!