Remove sound playing slots, as they do not work

game/sounds.h

@@ -32,12 +32,9 @@ static SoundType getRandomSoundType(SoundType min, SoundType max) {
     return GetRandomValue(min, max);
 }
 
-#define SOUND_MAX_PLAYING 16
-
 typedef struct SoundState {
     Rectangle cameraBounds;
     Sound sounds[SOUND_COUNT];
-    Sound playing[SOUND_MAX_PLAYING];
     // How long it needs to wait,
     // before playing the same sound
     f32 soundLastPlayed[SOUND_COUNT];