removed duplicate http content type

data/conf.d/60-modules.yml

@@ -34,7 +34,6 @@ modules:
 #  mod_stun_disco: {} #--> see 50-stun-turn.yml
 #  mod_http_api: {}
   mod_http_fileserver:
-    default_content_type: "text/html"
     docroot: "/home/ejabberd/www/"
     directory_indices:
       - "index.html"