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/data/decoration/icon.h

@@ -1,4 +1,4 @@
-const u32 *const gDecorIconTable[][2] = 
+const u32 *const gDecorIconTable[][2] =
 {
     [DECOR_NONE]            = {gItemIcon_QuestionMark, gItemIconPalette_QuestionMark},
     [DECOR_SMALL_DESK]      = {NULL, NULL},