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

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

This reverts commit 0616667d980db1aa32d6dd1956d6fc2e232cf5a3.

Change-Id: I0d024a3b75204521546380c955680cb4c8c9468e

Patchset: 1
http://review.cyanogenmod.org/#/c/74399/1