Set correct task remove mode when reparenting

If we are reparenting a task to a stack and the stack is at the front or will
be at the front, then set the the remove mode to REMOVE_TASK_MODE_MOVING_TO_TOP
so we don't try to move the focus to another stack and resume another activity.

Change-Id: Iddd7464dfff128544f2f70394ccd538b567fe58d
Fixes: 62088341
Test: ActivityManagerAppConfigurationTests
Test: go/wm-smoke