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.

asm/macros/battle_frontier/battle_factory.inc

@@ -88,7 +88,7 @@
 	.endm
 
 	@ Return the FACTORY_STYLE_* dependent on what types of moves the opponents team has, or FACTORY_NUM_STYLES if multiple styles tie for the same amount of moves
-	.macro factory_getopponentstyle 
+	.macro factory_getopponentstyle
 	setvar VAR_0x8004, BATTLE_FACTORY_FUNC_GET_OPPONENT_STYLE
 	special CallBattleFactoryFunction
 	.endm