Ensure the game mode setting doesn't conflict with available modes

If for any reason a game no longer supports a game mode, we need to make
sure we reset the configured mode in the user settings.

Bug: b/187082027

Test: atest com.android.server.app.GameManagerServiceTests

Change-Id: I73e4f71172ee84913431ed3c20ec420c04dcdbe4
2 files changed