Remove guest after "Reset guest" is used in QS

Fix issue where guests were marked for deletion but never removed.

Test: Switch to guest, run adb shell cmd user list -v --all, reset guest
      via QS, list users again and confirm that there is only one guest
Bug: 192012960
Change-Id: Ia74f302134406e6ba1f513170f4c0319b6338706
1 file changed