Error when adding user with multiple groups with bsdconfig

Hi

I'm on 11-CURRENT amd64. I wanted to add a user using "bsdconfig" but got
an error when adding to several groups.

Error message:
ERROR!: pw
pw: group `wheel daemon operator dialer network` does not exist.

Creating a user who is only added to one group (for example wheel) works
fine.

I have submitted a PR.
--
Johannes Lundberg

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