mkarchiso INFO message shows the profile path as the command

# mkarchiso -v ./configs/releng
[mkarchiso] INFO: mkarchiso configuration settings
[mkarchiso] INFO:                   Command:   ./configs/releng

_show_config expects that ${command_name} is a command, but with the new profile building method mkarchiso does not require a command. ${command_name} gets set to profile path as it's specified in the command line and shows a slightly confusing message in the verbose output.

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