Fix the visibility for disabled apps in settings

Bug: 30770664
Test: Manual -
1. Disable one app
2. Go to Settings -> Apps -> menu -> App permissions
3. to check the visibility of that app.

Don't show disabled app in the PermissionAppsFragment.

Change-Id: I0d97f7011c13c9a78e988901285f10ca9e5b2cd8
(cherry picked from commit 92c2b41b)