[pxebs] Consistently interpret PXE type field as little-endian

The PXE menu code also treated the type as big-endian, which went
unnoticed until the first fix because its ntohs() was matched by a
htons() in the PXE boot server discovery code.

Signed-off-by: Marty Connor <mdc@etherboot.org>

src/usr/pxemenu.c

 			  ( num_menu_items * sizeof ( (*menu)->items[0] ) ) );
 	memcpy ( raw_menu_item, raw_menu, raw_menu_len );
 	for ( i = 0 ; i < num_menu_items ; i++ ) {
-		(*menu)->items[i].type = ntohs ( raw_menu_item->type );
+		(*menu)->items[i].type = le16_to_cpu ( raw_menu_item->type );
 		(*menu)->items[i].desc = raw_menu_item->desc;
 		/* Set type to 0; this ensures that the description
 		 * for the previous menu item is NUL-terminated.