Made popupContainer's shadow & arrow visible in secondary display

Reduced elevation of app drawer to 0dp because it was conflicting with popup container elevation

Test: Manual
Change-Id: I222866ddfc44ebf9ecd9787bb448e502339a1688
Fix: 233932585
(cherry picked from commit 354fe14cd47fa3f15b10a7d91721d37ea872c03e)
1 file changed