Frameworks: do not kill favorite recent apps

Due of a lot user requests and I basically like the idea (not a fan of clear all apps at all
due that it does not make sense android wise) we ehance the favorite recent apps feature.

This commit basically does not remove the apps from the task list which were marked from the user
as favorite.

3 possibilities:

- No favorites are in the task list - clear all behaves like it was before - all tasks cleared and panel closes

- favorites and non favorites are in the task list - clear all removes all non favorite tasks and favorite tasks stay.
  Yes without fancy animations....we want to be fast ;) - panel stays open

- only favorites are in the list - pinch to zoom out is blocked due that nothing is there to clear all.

single clear of a task with swipe behaves in all cases normal like it was before this change

Change-Id: Ia05562e0f59dfb023aa65ec3a40dd951594dc88e
Signed-off-by: siracuervo <fl.siracusa@outlook.com.ar>

Conflicts:
	packages/SystemUI/src/com/android/systemui/slimrecent/RecentPanelView.java