Update ModesTile state even when arg == null

This happens on user change. Ignoring it means the tile still has the old user's data on the first shade expansion.

Fixes: 361770993
Test: atest ModesTileTest ZenModeInteractorTest ZenModeRepositoryTest ModesTileDataInteractorTest
Flag: android.app.modes_ui
Change-Id: Iaef362fe6417e1ff3c872069b3cf6d1b2264cecd