Fix dark room glyphs on level re-entry

include/extern.h

@@ -1607,6 +1607,7 @@ E char *FDECL(safe_qbuf, (char *, const char *, const char *, struct obj *,
 
 /* ### options.c ### */
 
+E void NDECL(reglyph_darkroom);
 E boolean FDECL(match_optname, (const char *, const char *, int, BOOLEAN_P));
 E void NDECL(initoptions);
 E void NDECL(initoptions_init);

src/do.c

@@ -1253,6 +1253,7 @@ boolean at_stairs, falling, portal;
         (void) nhclose(fd);
         oinit(); /* reassign level dependent obj probabilities */
     }
+    reglyph_darkroom();
     /* do this prior to level-change pline messages */
     vision_reset();         /* clear old level's line-of-sight */
     vision_full_recalc = 0; /* don't let that reenable vision yet */