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

This reverts commit f7cf967b84f00191f4dc01d9e102f11c8f4b9c75.

Change-Id: I885d0e8a88f61a7d28ecaa2338ce1debaf2a2c47
Fix NPE for WiFi off notification action

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