Log Message:
audio/fasttracker2: Updates to v1.18

Changes since v1.17:

v1.18 - 06.04.2020
- Windows: Fixed files >2GB displaying bogus filesizes in Disk Op.
- Fixed a potential crash in the audio mixer on quirky modules (when a
  channel's sampling rate is somehow set to 0).
- Fixed a bug with vertical scrollbars that have a very small thumb (v1.16)