TESTS: audio: adapt soundfont test reference file to fluidsynth2
TESTS: audio: adapt soundfont test reference file to fluidsynth2

The voice panning code is slighlty buggy in old fluidsynth versions (for
instance 1.1.11). New fluidsynth >= 2.0.0 fix the bug, so we need to
update the reference file.

Signed-off-by: Stefan Westerfeld <eb0877843acc39f8ef6f7269937dee931c372d23@space.twc.de>

tim-janik/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast