audio/fasttracker2: Update to 1.72.1

Changes since v1.69

v1.72 - 07.10.2023
- Block Cut (ALT+F3) and Block Copy (ALT+F4) was broken in v1.70

v1.71 - 04.10.2023
- CTRL+A/ALT+A keybindings were swapped (thanks to MIDRA2ADVANCE for telling me)

v1.70 - 01.10.2023
- Bugfix: Shrink Pattern ("Srnk.") could lead to a pattern length of 0
- Better variable sanitation for some pattern editing routines, may (?)
  prevent some rare crashes.
- CTRL+F5 (Paste Pattern) had wrong button names in its message box when asking
  to adjust the pattern length after pasting.
- Changed the above message box text to be easier to understand
- Removed audio dithering for 16-bit audio bit depth mode. It seemed to be
  wrongly implemented anyway.
- Some small changes done to the about screen
- Windows/macOS: Updated SDL to v2.28.3
- Code cleanup

(fox)