Toggle last app on recents long click
- 99,9% based on this commit: https://github.com/omnirom/android_frameworks_base/commit/6fb093b3311942beae7f51e23abbf18aa8c99bf8 with some minor modifications in NavigationBarView.java (By me).

Thanks @xplodwild

Change-Id: Icbd5484412bef17ac8468345266869e1278da508