fix nginx config

configs/nginx_include.conf

@@ -1,5 +1,5 @@
 location @drop_app {
-    proxy_pass http://unix:/tmp/drop.sock:/;
+    proxy_pass http://unix:/tmp/drop.sock;
     proxy_set_header Host $host;
     proxy_set_header X-Forwarded-For $remote_addr;
 }