Reload AppPermissionFragment when it is resumed.

This ensures that it picks up permission changes that happened when it
was in the background.

Fixes: 112642354
Test: Open fragment, disable permission, open the app, enable it,
switch back to the fragment, see the radio button change.
Test: Do the same but use adb to allow/revoke.

Change-Id: I314559244cd20511a63014e4144bc85d4e23567c