Fixing Exponential Quest Reward Scrolls (#7800)

* adding quest owner specific rewards. closes #2715

* Updating model to prevent this from being a breaking change.

* Removing duplicate translatable string and readding accidentally deleted portion

* capitalizing according to pr.

* fixing according to comments on pr

* removing final mistakes

* fixing whitespace

* re-adding the onlyOwner field that got deleted when the index.js file was moved and fixed console errors.

* moving cleaning of empty obejct for quest owner updates into quest owner updates method

* Fixing so tests pass by updating variable name and removing unnecessary parameter definition.

* adding a new test and refactoring client side code to use controller method.

website/client-old/js/controllers/inventoryCtrl.js

@@ -444,6 +444,10 @@ habitrpg.controller("InventoryCtrl",
       });
     };
 
+    $scope.getQuestOwnerRewards = function(quest) {
+      return _.filter(quest.drop.items, 'onlyOwner');
+    };
+
     function findPet (fn) {
       var pets = Object.keys(user.items.pets);
       return pets.find(function (petKey) {