Fix iframe component view. Closes #4480

src/canvas/index.ts

@@ -254,7 +254,7 @@ export default class CanvasModule extends Module<typeof defaults> {
     return this.getCanvasView().fixedOffsetEl;
   }
 
-  render() {
+  render(): HTMLElement {
     this.canvasView?.remove();
     this.canvasView = new CanvasView(this.canvas);
     return this.canvasView.render().el;

src/dom_components/view/ComponentFrameView.js

@@ -1,7 +1,7 @@
 import ComponentView from './ComponentView';
 import { createEl, find, attrUp } from 'utils/dom';
 
-export default class ComponentFrameView extends ComponentView.extend {
+export default class ComponentFrameView extends ComponentView {
   tagName() {
     return 'div';
   }