PIE: Fix random showing of navbar when swiping from top.

We need to condition here aswell to be sure top swipe doesn't trigger up
navbar at all even if we set its height to 0 is an useless call.

Addressing JIRA AOSPA-151 issue.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Fix: SysUi crash on Pie recents

https://paranoidandroid.atlassian.net/browse/AOSPA-79

When toggling recent apps using pie controls on secondary user account,
system ui crashes.

Change-Id: Id43b79dadf4cc4a88534aa18e1138b1daa7eece8
Fix: Graphics error when switching to recents using Pie controls

Attempt to fix https://paranoidandroid.atlassian.net/browse/AOSPA-65

I've never been able to reproduce the problem on Hammerhead, Mako or
Grouper, so I can't guarantee that this solves it.

Feedback is needed from a user that constantly experiences this bug.

Change-Id: I950e94dbb9b9d07dedee9b9f8cab6c5b6bceb6b0