Pending input screen shall remain in the background

Pending input screen shall also remain in the background while SIM
Toolkit is displaying a dialog on it by applying the same mechanism as
the secondary menu.

Bug: 112742596
Test: Confirmed that the pending activity can remain in the use-case.

Change-Id: Ifefca52e013f9a60375fee6658a6f600246739c7
1 file changed