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
Launch SuperSU from Settings