Don't allow foreground notis to be blocked inline.

Offer a 'minimize' option instead.

Also I'm changing the guts, do a little layout
cleanup in the confirmation dialog.

Change-Id: I9f2ef824d1f322752bc4161356f16a5dae166caf
Fixes: 73898083
Fixes: 73657862
Fixes: 73657452
Test: runtest systemui-notification