Remove hardly used compose shortscuts

_ansible/roles/tinytinyrss/vars/main.yml

@@ -21,13 +21,14 @@ svc_env:
 compose:
   watchtower: false
   image: cthulhoo/ttrss-web-nginx
-  depends_on:
-    - tt-rss
   env: true
   volumes:
     - app:/var/www/html:ro
     - ./nginx.conf:/etc/nginx/nginx.conf
   file:
+    app:
+      depends_on:
+        - tt-rss
     services:
       tt-rss:
         image: cthulhoo/ttrss-fpm-pgsql-static