Halo : bug fix
- no notification left, but swiping halo still launchs app after tasking
- halo button animations don't need to be processed if it's not enabled

base on commit:
vanir : https://github.com/VanirAOSP/frameworks_base/commit/6dfff3d4f425a1dd0090df71ca249eed81f9cee5
lion378 : https://github.com/lion0738/android_frameworks_base/commit/f6386fdef4919350c64147c2a617950114d026d7