Settings: Fix NPE in Superuser settings.

Change-Id: I4671a7840df4a6b66c43d99c7f37cc8038829f08
Settings: Check if NFC is supported prior to adding to pager.

  - Also fix codestyle and comments for TriggerFragments

Change-Id: Iae0bcf8ca6a5447e70750e258db9599dd8a2704e