[FIX] web: abstract_view: don't override shared config variable

The method 'setController' allows to change the default Controller
Widget used by the view. However, before this fix, calling it
changed the default Controller of all other Controller instances.

addons/web/static/src/js/views/abstract_view.js

@@ -119,7 +119,7 @@ var AbstractView = Class.extend({
         return $.when(model.load(this.loadParams), this._loadLibs()).then(function () {
             var state = model.get(arguments[0]);
             var renderer = self.createRenderer(parent, state);
-            var Controller = self.config.Controller;
+            var Controller = self.Controller || self.config.Controller;
             var controllerParams = _.extend({
                 initialState: state,
             }, self.controllerParams);
@@ -149,7 +149,7 @@ var AbstractView = Class.extend({
      * @param {Controller} Controller
      */
     setController: function (Controller) {
-        this.config.Controller = Controller;
+        this.Controller = Controller;
     },
 
     //--------------------------------------------------------------------------