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_gfx_sfx_util.c

@@ -139,7 +139,7 @@ u16 ChooseMoveAndTargetInBattlePalace(void)
     // Each nature has a different percent chance to select a move from one of 3 move groups
     // If percent is less than 1st check, use move from "Attack" group
     // If percent is less than 2nd check, use move from "Defense" group
-    // Otherwise use move from "Support" group 
+    // Otherwise use move from "Support" group
     for (; i < maxGroupNum; i++)
     {
         if (gBattlePalaceNatureToMoveGroupLikelihood[GetNatureFromPersonality(gBattleMons[gActiveBattler].personality)][i] > percent)
@@ -196,7 +196,7 @@ u16 ChooseMoveAndTargetInBattlePalace(void)
             if ((validMoveFlags & 0xF0) > 0x1FF)
                 numValidMoveGroups++;
 
-            
+
             // If more than 1 possible move group, or no possible move groups
             // then choose move randomly
             if (numValidMoveGroups > 1 || numValidMoveGroups == 0)