Setttings: Finish activity on AppOpsDetails if user press the back button

...in the action bar.

Change-Id: I9443d2396b3564221993930eb56f5edea84d7d2e
PGM: Ask user on single click if he really wants to fast enable PG

Like @Yank555 mentioned a lot ppl tend to accidentaly enable other apps as well during
going trough the list. To prevent this the user needs to confirm a Dialog now to finally enable it.

As well the Dialog text changed and reflects the app name as well so that the user is clearly notified
what happens with what app.

Change-Id: I748eb12fbb51feff665126ab9d94703b78982f53