server: Fix umask setting when --group is specified #478
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p11-kit server previously set umask(066) unconditionally before chown and that resulted in removing group read/write bits, even if --group is specified. This fixes the logic to respect --group and also allows it to be specified without --user.
Originally reported in:
https://lists.freedesktop.org/archives/p11-glue/2023-January/000725.html