Tag selected user when rqeuest made by admin

[BigJazzz]

I'm not sure if this is a bug or feature request, but I'm happy to open a bug report if needed.

When I request an item as another user, it should tag the user I've selected on Discord. There's been a few occasions where I've needed to find media for them for various reasons, and having them tagged on request would mean they know when I've gotten to it.

They are tagged when the available post is made, as expected.