fix: use better "ps" format

[adamdecaf]

During emulation the running processes can contain binary names which trip up detecting if a process is already running. Using the comm format will print the running binaries without arguments.

Previous: https://github.com/ibm-messaging/mq-container/pull/524

Issue: https://github.com/ibm-messaging/mq-container/issues/476

[raja]

Thank you! cc: @david-r-bell