Log Message:
audio/fasttracker2: Update to 1.55

Changes since v1.54

v1.55 - 14.06.2022
- Fixed crash when using "Copy smp." on an empty dest. or source instrument
- Fixed: Using "Copy Ins." on an empty source instrument resulted in a
  non-sensical system message.
- Reset pattern loop states on "Play Song", fixes a potential bug