Modulo typos, there was already a test that would have shown the problem.
Uncomment it.
A common character set is not required for TString operations; they are performed in Unicode.
merge MMcM: String operations do not require the same character set

Merge pull request #1133 from MMcM/sql-layer/tstring-pick-charset
https://github.com/FoundationDB/sql-layer/pull/1133