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/start_menu.c

@@ -198,12 +198,12 @@ static const struct WindowTemplate sWindowTemplates_LinkBattleSave[] =
 };
 
 static const struct WindowTemplate sSaveInfoWindowTemplate = {
-    .bg = 0, 
-    .tilemapLeft = 1, 
-    .tilemapTop = 1, 
-    .width = 14, 
-    .height = 10, 
-    .paletteNum = 15, 
+    .bg = 0,
+    .tilemapLeft = 1,
+    .tilemapTop = 1,
+    .width = 14,
+    .height = 10,
+    .paletteNum = 15,
     .baseBlock = 8
 };