Fixed memory leak with the inflater

Because min priority children could be removed from
their parents after the removal, a new inflation task
would be started, leading to the view being instantly
readded again. This lead to memory leaks.

It also fixes a bug where the inflation would not inflate
enough views that could lead to crashes / wrong layouts.

Finally there was a indexing error when handling removal
of group summaries.

Test: runtest -x packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/NotificationInflaterTest.java
Change-Id: Iac242946bd30060967ee7877560d40e63f39f996
Fixes: 62067645