Fix #574

Signed-off-by: Mario Danic <mario@lovelyhq.com>

app/src/main/java/com/nextcloud/talk/controllers/CallController.java

@@ -886,6 +886,7 @@ public class CallController extends BaseController {
     @Override
     public void onDestroy() {
         onHangupClick();
+        powerManagerUtils.updatePhoneState(PowerManagerUtils.PhoneState.IDLE);
         super.onDestroy();
     }