PrivacyGuard: confirm permissions reset

The button to reset all application permissions to enabled looks
suspiciously like a refresh button. Prompt the user with a confirmation
dialog to make sure they know what they've pressed.

Change-Id: I0444c5bf8e9533feccf890055d34d3200609c6f6
Settings: Don't hide home category if user has a settings capable launcher

By default the settings app hides the home category if it notices the user
has 1 launcher. Due to the ability to have settings per launcher, if the
user only has one launcher which happens to support settings, hiding this
category renders that feature useless.

So now we check if the user has < 2 launchers AND whether they support
a settings panel.

Change-Id: Id5dd94091a31fd9ee3637e0975816481903255bf