QtTestLib's blacklisting doesn't take global data tags into account

When a test has global data (set up by its initTestCase_data() function), it reports itself with a name like name:global:local, so the naive user blacklisting a test is apt to think this is a reasonable entry to put inside square brackets in a blacklist file. However, checkBlackLists() only gets passed the test name and local data-row tag, without a global data-row tag.
So the name the test reports doesn't get recognised and using it in the blacklist file doesn't work.
Discovered as a result of a review that thought it was blacklisting tests but wasn't.