Fix test-query-select-unicode on MSSQL

MSSQL requires N'☯ąčęėįšųūž☎áäàéêèóöòüßÄÖÜ€ шчябы Ⅲ ❤' but sqlite
doesn't support national character literals. Relying on default
collation being unicode-capable is also non-standard, however...