Entering special room, wake up only that room

... instead of doing a level-wide wake-up.

Fixes #429

src/hack.c

@@ -2650,6 +2650,9 @@ check_special_room(boolean newlev)
                 for (mtmp = fmon; mtmp; mtmp = mtmp->nmon) {
                     if (DEADMONSTER(mtmp))
                         continue;
+                    if (!isok(mtmp->mx,mtmp->my)
+                        || roomno != levl[mtmp->mx][mtmp->my].roomno)
+                        continue;
                     if (!Stealth && !rn2(3))
                         mtmp->msleeping = 0;
                 }