There is a much simpler way to access table name in ResultSetMetadata
in Firebird sdbc which I didn't notice before.

Change-Id: Ib306c04acf38ec86475d8d1a22a67012fe48539e
Reviewed-on: https://gerrit.libreoffice.org/30931Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Lionel Elie Mamane <lionel@mamane.lu>