Fix the "Midnight" art on help (F1) page.

diff -Naurdp mc-4.6.0.orig/src/help.c mc-4.6.0/src/help.c
--- mc-4.6.0.orig/src/help.c	2002-11-13 05:01:05.000000000 +0100
+++ mc-4.6.0/src/help.c	2004-11-11 12:07:23.000000000 +0100
@@ -441,7 +441,7 @@ static void help_show (Dlg_head *h, char
 #ifndef HAVE_SLANG
 			addch (acs_map [c]);
 #else
-			SLsmg_draw_object (h->y + line + 2, h->x + col + 2, c);
+			SLsmg_draw_object (h->y + line + 2, h->x + col + 2, acs_map[c]);
 #endif
 #else
 			addch (acs2pc (c));