GBA Serialize: Fix loading channel 3 volume (fixes #1107)

CHANGES

@@ -36,6 +36,7 @@ Bugfixes:
  - GBA Video: Start timing mid-scanline when skipping BIOS
  - Core: Fix audio sync breaking when interrupted
  - Qt: Improve FPS timer stability
+ - GBA Serialize: Fix loading channel 3 volume (fixes mgba.io/i/1107)
 Misc:
  - GBA Timer: Use global cycles for timers
  - GBA: Extend oddly-sized ROMs to full address space (fixes mgba.io/i/722)

src/gba/io.c

@@ -293,7 +293,7 @@ static const int _isWSpecialRegister[REG_MAX >> 1] = {
 	0, 0, 0, 0, 0, 0, 0, 0,
 	// Audio
 	1, 1, 1, 0, 1, 0, 1, 0,
-	1, 1, 1, 0, 1, 0, 1, 0,
+	1, 0, 1, 0, 1, 0, 1, 0,
 	1, 0, 1, 0, 0, 0, 0, 0,
 	1, 1, 1, 1, 1, 1, 1, 1,
 	1, 1, 1, 1, 0, 0, 0, 0,