Don't accidently clear TRANSPARENT_VERTICAL_NAV

The effect of the TRANSPARENT_VERTICAL_NAV flag was getting
accidently cleared as a result of setting an unrelated flag.

This flag is used by CameraNext to allow a transparent nav
bar to be used when in landscape mode, which is not a valid
thing under AOSP 5.1.

CYNGNOS-1165

Change-Id: Ib363adcb54dd2598a30926a5224c5b3b41316cbb