api: Fix /api/endpoints/ javascript for now.

This was apparently completely broken for some time, and got a bit
worse with my recent changes (enough to fail a test).

Since the plan for this page likely involves dissecting and
eliminating it, I think it makes sense to just fix it hackishly and
move on.

templates/zerver/api_endpoints.html

@@ -4,7 +4,6 @@
 
 {% block customhead %}
 {{ super() }}
-{{ render_bundle('api') }}
 {% endblock %}
 
 {% block portico_content %}
@@ -61,4 +60,10 @@ <h3>Example response</h3>
         </div>
         {% endfor %}
     {% endautoescape %}
+    <script>
+        $('a[data-toggle="tab"]').on('shown', function (e) {
+            $("." + $(e.target).data("class")).show();
+            $("." + $(e.relatedTarget).data("class")).hide();
+        });
+    </script>
 {% endblock %}