Add animation when using navbar recent long press toggle last app

- Fix a little derp in PhoneStatusBar / private View.OnClickListener mRecentsClickListener leading to double click recent button need to preload recents panel work after every use of toggle last app feature
- There's no need to check this -> private boolean mRecentsLongClicked = true or false;
- Also cancelPreloadingRecentTasksList() everytime we call TaskUtils.toggleLastAppImpl(mContext);

Based on cm commit: https://github.com/CyanogenMod/android_frameworks_base/commit/2578c4748bf44c726957f94ffc7c4d265da2637b

Change-Id: Ie459f4be510e0eda7fa39270e863f011edc9a8d0