Allow absence of latest release zip

https://github.com/alexbelgium/hassio-addons/issues/380

qbittorrent/rootfs/etc/cont-init.d/30-nginx.sh

@@ -43,8 +43,7 @@ xargs) || LATEST_RELEASE=$(curl -f -s --retry 5 -L https://api.github.com/repos/
     grep "browser_download_url.*zip" |
     cut -d : -f 2,3 |
     tr -d \" |
-    head -n 1 |
-xargs)
+    head -n 1)
 
 [ "$DEBUG" = "debug" ] && echo "url: $LATEST_RELEASE"