Fix vault guard leaving monsters encased in stone

For some reason the vault guard fake corridor code checked
if the hero was outside the corridor before removing monsters.
But the vault end of the corridor usually gets sealed off
even while you're still in the corridor. This left monsters
stuck in solid rock.

src/vault.c

@@ -76,7 +76,7 @@ boolean forceshow;
         if ((mtmp = m_at(fcx, fcy)) != 0) {
             if (mtmp->isgd) {
                 return FALSE;
-            } else if (!in_fcorridor(grd, u.ux, u.uy)) {
+            } else {
                 if (mtmp->mtame)
                     yelp(mtmp);
                 if (!rloc(mtmp, TRUE))