SystemUI: Trim whitespace on a string resource

The floating_mode_blacklisted_app string resource has seemingly
unnecessary whitespace. This commit removes that.

Change-Id: I8f24778395912a684e99d9e847d544db9335b114
SystemGestures: Filter navbar interactions

- Since we don't hardcode edge gesture service here (bad),
  let's avoid pulling statusbar when swiping from bottom and pie is on.

- Also cleanup a duplicated registered observer.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java