Do not count disabled apps in PermController

Ensures that disabled apps are not included in the granted and total
counts shown on the ManagePermissions screen.

Fixes: 141012718

Test: Select an app which has granted permissions in a given permission
group. Disable this app, and check the granted and total counts for that
permission group. The counts should both be decreased by 1.

Change-Id: I52a7dd7c7cc8eb192bc89cd477b8eeb8f24c9ff8