Don't split value of -r CLI option on comma

[mojavelinux]

Currently, if the value of the -r CLI option contains a comma, the CLI will split the value on the comma and treat it as two separate paths.

There's really no need for this magic since the -r option may be specified multiple times. It can introduce problems if the filename contains a comma, which is a valid filename character. And there's no way to escape it. Therefore, the value of this option should be accepted as is rather than being interpreted. It's not a documented behavior anyway.