Make notification-shade-collapse-after-dismiss behaviour configurable.

Change-Id: Icbf706a582279b86d901fb727b58663713606521
Merge "Make notification-shade-collapse-after-dismiss behaviour configurable." into cm-10.1
Settings: merge CyanogenMod

Change-Id: I1085ed1ceb9b273dbc7737c12a1aab171195a5c3