change nginx configs listen to ipv4 only

resources/dwc2_nginx.cfg

@@ -9,7 +9,7 @@ upstream dwc2 {
 
 server {
     listen 80;
-    listen [::]:80;
+    #listen [::]:80;
 
     location / {
         proxy_pass http://dwc2/;

resources/octoprint_nginx.cfg

@@ -13,7 +13,7 @@ upstream mjpg-streamer {
 
 server {
     listen 80;
-    listen [::]:80;
+    #listen [::]:80;
 
     location / {
         proxy_pass http://octoprint/;