add missing defineElement decorator

Author: madsrasmussen

packages/uui-keyboard-shortcut/lib/uui-key.element.ts

@@ -1,3 +1,4 @@
+import { defineElement } from '@umbraco-ui/uui-base/lib/registration';
 import { css, html, LitElement } from 'lit';
 import { queryAssignedNodes } from 'lit/decorators.js';
 
@@ -6,6 +7,7 @@ import { queryAssignedNodes } from 'lit/decorators.js';
  *  @element uui-key
  *  @slot - for the key name. Anything you put in here will be lowercase.
  */
+@defineElement('uui-key')
 export class UUIKeyElement extends LitElement {
   static styles = [
     css`