Add option to disable search bar in recents [2/2]

Coded from scratch by yashade2001.
Firstly written for Project D.I.S.C.O. ROM.
Thanks to TheMrcool212 for his help.

Signed-off-by: Yashar Ahmedizadeh <yashade2001@gmail.com>

Conflicts:
	packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java

Change-Id: I3f985aab873d05350c8301bdedae5eeee49f70c7