launcher: change default state for RecentsActivity

When the user presses the home button, because fallback Recents doesn't
have a way to change the state, we rely on `onStop` to reset the state.
This makes the state be cleared correctly.

Fixes 192254944
Test: follow the bug

Change-Id: I177b09392214d078373e3852517b57d9172d944d
2 files changed