Removed trailing spaces in the most relevant files

Command used for the job:
egrep -rl ' $' --include *.c --include *.h --include  *.s --include  *.inc --include  *.txt *  | xargs sed -i 's/\s\+$//g'

Credits to Grant Murphy from Stack Overflow.

src/minigame_countdown.c

@@ -453,7 +453,7 @@ static bool32 RunMinigameCountdownDigitsAnim(u8 spriteId)
     case 1:
         if (sprite->sTimer == 0)
             PlaySE(SE_BALL_BOUNCE_2);
-        
+
         if (++sprite->sTimer >= 20)
         {
             // Ready for jump