fix type while create table with UUID column

This PR is inspired by [this](https://github.com/playframework/play-slick/issues/203) issue.

I'm not sure it's necessary to do it at all, but if it's relevant, then I can make backports to any branches you would tell.

Also if something is missing, I'm glad to fix it.

Thanks in advance.

Cheers, Nick.
Actually, this was supposed to show, that my changes do not break tests. But if you think, it's not necessary, I'll remove it.