Canvas2D: Shape2D fill and border change bug

[Trello](https://trello.com/c/QqIn8U67)

canvas2D/src/Engine/babylon.smartPropertyPrim.ts

@@ -1170,6 +1170,7 @@
             // Set the dirty flags
             if (!instanceDirty && (propInfo.kind === Prim2DPropInfo.PROPKIND_MODEL)) {
                 if (!this.isDirty) {
+                    this.onPrimBecomesDirty();
                     this._setFlags(SmartPropertyPrim.flagModelDirty);
                 }
             } else if (instanceDirty || (propInfo.kind === Prim2DPropInfo.PROPKIND_INSTANCE) || (propInfo.kind === Prim2DPropInfo.PROPKIND_DYNAMIC)) {