Revert "Keep FLAG_SHOW_WALLPAPER flag on NotificationShade."

This reverts commit 5e48aeeaddb94c7f03213664c227618c80a3060f.

Reason for revert: Droidfood blocking bugs  bug: 203025772 & bug: 203041994

Bug: 203041994
Bug: 203030884
Bug: 203025772
Change-Id: I768c13d2959fb92d2a5d038df560e1575aea0712
11 files changed