Go back from fragments on error

When a package is uninstalled while a permission screen for that app is
shown, back out of that fragment, instead of finishing the activity.

Fixes: 150461117
Test: Install an app, then navigate to a fragment, then uninstall it
(via adb). The fragment should back out.

Change-Id: I87081004437540bd0a6944c6fcc691c7d32c21fb