Fix UNIC Tracker instrument finetune test

Reported by Andreas Argirakis:

"This is supposedly a unic tracker 1.4 (sometimes called v2), the module
 sad-song from the demo http://www.exotica.org.uk/wiki/Guardian_Dragon.
 It is not recognized by libxmp."

Note: this is a correctly ripped version of sad-song. The file currently
      in Exotica was ripped as a MOD file.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>