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/battle_anim_electric.c

@@ -1305,7 +1305,7 @@ void AnimTask_ShockWaveLightning(u8 taskId)
 static bool8 CreateShockWaveLightningSprite(struct Task *task, u8 taskId)
 {
     u8 spriteId = CreateSprite(&gLightningSpriteTemplate, task->data[13], task->data[14], task->data[12]);
-    
+
     if (spriteId != MAX_SPRITES)
     {
         gSprites[spriteId].callback = AnimShockWaveLightning;