Revert "Revert "Add "Turn WiFi off" action to "Open networks" notification""

This reverts commit fb1608a3b2a2ae70de49ba30596f1fb09539594b.

Change-Id: Iae9372285690c46591b26cdc34b3237b5d0d1bf5
Fix NPE for WiFi off notification action

Change-Id: Ieaa4026f192c1487e74e7b6a96f628661602c595
Signed-off-by: Gergely Szell (sethyx) <sethyx@gmail.com>