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

packages/SystemUI/src/com/android/systemui/statusbar/policy/UserSwitcherController.java

@@ -671,6 +671,7 @@ public class UserSwitcherController implements Dumpable {
                     scheduleGuestCreation();
                 }
                 switchToUserId(targetUserId);
+                mUserManager.removeUser(currentUser.id);
             }
         } catch (RemoteException e) {
             Log.e(TAG, "Couldn't remove guest because ActivityManager or WindowManager is dead");