typeahead: Don't call html with a jquery object.

This is helpful beyond appeasing the linter, because TypeScript only
[permits](https://unpkg.com/browse/@types/jquery@3.5.29/JQuery.d.ts#L5287)
`.html(…)` to accept a `string` or `HTMLElement` argument (or
function returning those), not JQuery. The behavior with a JQuery
argument is also [undocumented](https://api.jquery.com/html/#html2).

web/third/bootstrap-typeahead/typeahead.js

@@ -359,7 +359,7 @@ Typeahead.prototype = {
         });
 
         $items.first().addClass("active");
-        this.$menu.html($items);
+        this.$menu.empty().append($items);
         return this;
     },