Fix ACL SETUSER when adding specified categories

[RohanNagar]

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[RohanNagar]

Hi @mp911de, I was trying to run the ACL SETUSER command with added categories and found this bug in the implementation. I hope it's ok that I created this without an issue, I figured it was straightforward enough to fix and submit the patch for. Please let me know if I can do anything to help get this through the approval process and into the next release. Thank you!

[mp911de]

Thanks a lot, that's an obvious bug, so fine having a pull request only.

[mp911de]

Thank you for your contribution. That's merged, polished, and backported now.

[RohanNagar]

Thank you!