[BUGFIX beta] sets the controller _qpDelegate

before mapping all the queryParams. 

In certain scenarios, if query params are shared 
through a service, bound query params will 
fire the _qpDelegate while transitioning to a new
controller if the property has been modified from
it's default value. 

Loosely related to 
  - emberjs#11592

Based on a previous PR 
  - emberjs#13981

packages/ember-routing/lib/system/route.js

@@ -1316,6 +1316,9 @@ let Route = EmberObject.extend(ActionHandler, Evented, {
     let queryParams = get(this, '_qp');
 
     let states = queryParams.states;
+
+    controller._qpDelegate = states.allowOverrides;
+
     if (transition) {
       // Update the model dep values used to calculate cache keys.
       stashParamNames(this.router, transition.state.handlerInfos);
@@ -1337,8 +1340,6 @@ let Route = EmberObject.extend(ActionHandler, Evented, {
       });
     }
 
-    controller._qpDelegate = states.allowOverrides;
-
     if (transition) {
       let qpValues = getQueryParamsFor(this, transition.state);
       controller.setProperties(qpValues);