Revert "Enable custom actions for double tap home (2/2)"

This reverts commit 7c635067d2356b2cb9aa724f140f7a59d990a977.
Merge branch 'head' into cm-10.2

Conflicts:
	src/com/android/settings/cyanogenmod/ButtonSettings.java

Change-Id: I11132f6418146b51a82e51e82c2d9a001993de2d