Merge pull request #6637 from nextcloud-libraries/backport/6636/next

[next] fix(focus-trap): provide HTMLElement as fallbackFocus

Author: ShGKme

src/components/NcAppSidebar/NcAppSidebar.vue

@@ -1008,7 +1008,7 @@ export default {
 				document.querySelector('#header'),
 			], {
 				allowOutsideClick: true,
-				fallbackFocus: this.$refs.closeButton,
+				fallbackFocus: this.$refs.closeButton.$el,
 				trapStack: getTrapStack(),
 				escapeDeactivates: false,
 			})