remove unnecessary exposed port for xdebug in docker-compose.yml

[layerok]

there is no need to bind port for xdebug

see comment from Derick

You don't need "bind port" in docker-compose.yaml for Xdebug, as Xdebug does make the connection to the IDE, and hence the port does not need to be exposed for receiving connections.

I tested that xdebug works without binding a port in docker-compose.yml