DO NOT MERGE Add flag to default dialer change dialog

Add PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS to default dialer
change dialog to prevent clickjacking.

Fixes: 132275252
Test: manual. CTS infeasible since it's UI.
Change-Id: I0d5997915a71e317d5c0d654a499d8cbd21f2299
(cherry picked from commit 047d272541e388cd96638c6d6a7ccb676d34ac3f)
1 file changed