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.
Yeah, I guess let's remove this test and use the codegen test I suggested below. If UUID makes the roundtrip through codegen then this is probably a decent test.