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/post_battle_event_funcs.c

@@ -64,7 +64,7 @@ int GameClear(void)
     {
         IncrementGameStat(GAME_STAT_RECEIVED_RIBBONS);
         FlagSet(FLAG_SYS_RIBBON_GET);
-        
+
         for (i = 1; i < 6; i++)
         {
             if (ribbonCounts[i].count > ribbonCounts[0].count)