search: Use <output> rather than <div role="status">

Thanks axe plugin.

_includes/search-dictionary.html

@@ -20,11 +20,10 @@
   <button id="search-dictionary-clear" class="button is-outlined ml-6">
     Clear
   </button>
-  <div
+  <output
     id="search-dictionary-results"
-    role="status"
     class="notification is-light mt-4 is-hidden"
-  ></div>
+  ></output>
 </form>
 <script async>
   /** The form fields, for keying into the FormData. */