Fixed empty canonicals

roles/web-app-libretranslate/config/main.yml

@@ -22,7 +22,8 @@ csp:
   whitelist:        {}      # URL's which should be whitelisted
   flags:            {}      # Flags which should be set
 domains:
-  canonical:        {}      # Urls under which the domain should be directly accessible
+  canonical:
+    - "libretranslate.{{ primary_domain }}"
   aliases:          []      # Alias redirections to the first element of the canonical domains
 rbac:
   roles: {}