base: show notification count overlay only on notifications > 1

Change-Id: Ib52f7c365193f26f6ff983bd87fc7aaa9b63c46e
Base: more fix Active Display (again)

maybe fix
http://jira.omnirom.org/browse/OMNI-313
http://jira.omnirom.org/browse/OMNI-421
http://jira.omnirom.org/browse/OMNI-401

Change-Id: Id947e18a9299200f1ccd41aa70e56534fdbb4b57
Merge "base: show notification count overlay only on notifications > 1" into android-4.4
Merge pull request #3 from omnirom/android-4.4

base: show notification count overlay only on notifications > 1