Removed private declaration for Animation property on graph 2D

Frontend Angular 4/src/app/layout/plotter/graph2D/graph2D.component.ts

@@ -17,7 +17,7 @@ export class Graph2DComponent {
 
     private instance: null;
 
-    private animation: Animation = {
+    animation: Animation = {
         data: [],
         timer: null,
         currentFrame: 0,