Add missing waffle template tag

cl8/templates/_profile_empty.html

@@ -1,4 +1,4 @@
-{% load static widget_tweaks %}
+{% load static widget_tweaks waffle_tags %}
 <div class="profile prose pl-6 pt-8 mt-[5rem]">
     <h2 class="text-xl font-normal">
         Find people in the {{ request.constellation }} community based on what they do, where they live, what they're asking for help with, and what they're offering to other members.