Fix nginx config for django admin interface after breaking it in b9535680

vars/main.yml

@@ -26,8 +26,8 @@ nginx:
             - uwsgi_pass internal-mailman3-uwsgi
             - include uwsgi_params
             - uwsgi_param REMOTE_USER $http_REMOTE_USER
-        - match: /mailman3/static/CACHE # Used by Hyperkitty
-          alias: /var/lib/mailman3/web/static/CACHE
+        - match: /mailman3/static # Hyperkitty uses /CACHE/, django-admin /admin/
+          alias: /var/lib/mailman3/web/static
         - match: /mailman3/static/django-mailman3
           alias: /usr/share/python3-django-mailman3
         - match: /mailman3/static/postorius