Tiptap: Block extension config refresh (#18569)

Refreshes the UI after the Block extension
option has been set as enabled/disabled.

Fixes #18541

src/Umbraco.Web.UI.Client/src/packages/tiptap/property-editors/tiptap/components/property-editor-ui-tiptap-extensions-configuration.element.ts

@@ -87,6 +87,8 @@ export class UmbPropertyEditorUiTiptapExtensionsConfigurationElement
 						this.#setValue(tmpValue);
 						this.#syncViewModel();
 					}
+
+					this.requestUpdate('_extensions');
 				},
 				'_observeBlocks',
 			);