SystemUI: fix nav bar arrow keys for RTL locales

Change-Id: I567636ab0beff3ad6e12c8552cf0d1447d7bc288
Signed-off-by: Roman Birg <roman@cyngn.com>
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_frameworks_base into android-4.4_new