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_dome.c

@@ -5800,7 +5800,7 @@ static void InitRandomTourneyTreeResults(void)
     gSaveBlock2Ptr->frontier.lvlMode = FRONTIER_LVL_50;
     zero1 = 0;
     zero2 = 0;
-    
+
     gSaveBlock2Ptr->frontier.domeLvlMode = zero1 + 1;
     gSaveBlock2Ptr->frontier.domeBattleMode = zero2 + 1;