fix spacing

Author: the-djmaze

.docker/release/files/etc/nginx/nginx.conf

@@ -51,9 +51,9 @@ http {
     image/svg+xml;
 
   server {
-	listen 8888;
-	listen [::]:8888;
-	#listen [::]:8888 ipv6only=off;
+    listen 8888;
+    listen [::]:8888;
+    #listen [::]:8888 ipv6only=off;
     root /snappymail;
     index index.php;
     charset utf-8;