Fix missing cast when comparing a guid and string column in Sql Server

[maca88]

Fixes #2040

[fredericDelaporte]

Since this is likely a 5.2 regression, it should target 5.2.x. But I have not checked yet it was working in 5.1.x.

[maca88]

Changed the target to 5.2. I've ran the tests on 5.1.x branch and they all work.

[fredericDelaporte]

Thanks Maca.

Since we have just released 5.2.4, and that this regression is not major, I intend to wait a bit before releasing a 5.2.5, in case some other things need a fix before the end of the month. So this PR will wait a bit, in case we just have to add the release commit here if there is nothing else to fix at the end of the month.

[fredericDelaporte]

I think about it a bit too late, but it seems SAP SQL Anywhere also needs a fix.

To spot it more easily while not failing PRs on 5.1x or earlier, I have enabled the build on master and 5.2.x. So we will still see troubles a bit too late, after PRs merges, but that will reduce a risk of releasing a regression on that database.