[editor] Improve delete key logic

This now uses "closest" to check parent nodes.
This still does not work properly since some elements can not be clicked 
and the event returns the body element. This might be fixed if a way to 
make those elements clickable is found.

projects/editor/src/app/components/unit-view/page-view/canvas/canvas-element-overlay.ts

@@ -54,9 +54,9 @@ export abstract class CanvasElementOverlay implements OnInit, OnDestroy {
 
   @HostListener('window:keydown', ['$event'])
   handleKeyDown(event: KeyboardEvent): void {
-    if ((event.target as Element).parentElement &&
-        (event.target as Element).parentElement!.parentElement &&
-        (event.target as Element).parentElement!.parentElement!.className.indexOf('aspect-inserted-element') > -1 &&
+    if ((event.target as Element).tagName !== 'INPUT' && (event.target as Element).tagName !== 'TEXTAREA' &&
+        ((event.target as Element).className.indexOf('aspect-inserted-element') > -1 ||
+        (event.target as Element).closest('.aspect-inserted-element')) &&
         event.key === 'Delete') {
       this.selectionService.selectedElements
         .pipe(take(1))