Fix no response after entered split screen

Make sure to update stage root's bounds and reset the surface position
of opening apps to prevent double offset instead.

Fix: 245055674
Bug: 244671191
Test: enter split screen by long pressing on shortcut, anotehr side can
      receive touch events after entered split screen.
Change-Id: Ie186cfa3b1406514ce8c33cd7321b8b9df40af26