Ignore signals from RecentTasks for frozen task list

Let Launcher be the one controlling when to
enable/disable edge gesture as well as determining
the current rotation. This is to prevent resetting
the home handle/edge gesture when user swipes up to
overview and exceeds the frozen time out limit.

Fixes: 156053957
Change-Id: Ic79015d358f3a222cec86f3925e00ee978159bba