Revert "SystemUI: Fix missing top task in recent panel."

See http://review.cyanogenmod.org/#/c/74397/

This reverts commit 0616667d980db1aa32d6dd1956d6fc2e232cf5a3.

Change-Id: I0d024a3b75204521546380c955680cb4c8c9468e
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0