Apply dest. limit to monster trap door usage

To prevent monsters from falling past the bottom level or into the
sanctum early, and to maintain consistency between monster and hero hole
usage.

src/teleport.c

@@ -1540,6 +1540,7 @@ mlevel_tele_trap(
                 return Trap_Effect_Finished;
             } else {
                 assign_level(&tolevel, &trap->dst);
+                (void) clamp_hole_destination(&tolevel);
             }
         } else if (tt == MAGIC_PORTAL) {
             if (In_endgame(&u.uz) && (mon_has_amulet(mtmp)