zeronet.sh doesn't run the node with --rpc-port parameter

zeronet.sh is not able to successfully run the node using: ./zeronet.sh start --rpc-port 8732

The command fails with the following logs:

ERROR: The Compose file '/Users/tezosuser/.tezos-zeronet/docker-compose.yml' is invalid because:
services.node.ports is invalid: Invalid port "--rpc-port:8732", should be [[remote_ip:]remote_port[-remote_port]:]port[/protocol]

The issue is related to line 34 in zeronet.sh file. I suppose that you should use the $2 var instead of $1.

I'm working on the zeronet branch (last commit ec9e2c94)