Remove extra mock

public/app/plugins/panel/heatmap/specs/heatmap_ctrl.jest.ts

@@ -5,22 +5,19 @@ describe('HeatmapCtrl', function() {
   let ctx = <any>{};
 
   let $injector = {
-      get: () => {}
+    get: () => {},
   };
 
   let $scope = {
     $on: () => {},
-    events: {
-        on: () => {}
-    }
   };
 
-HeatmapCtrl.prototype.panel = {
+  HeatmapCtrl.prototype.panel = {
     events: {
       on: () => {},
-        emit: () => {}
-    }
-};
+      emit: () => {},
+    },
+  };
 
   beforeEach(() => {
     ctx.ctrl = new HeatmapCtrl($scope, $injector, {});