Steed #monster breath feedback

Using #monster to make the steed use the breath weapon often
failed because the steed did not want to breathe at weak or
too strong monsters.
Make #monster force the steed use the breath, and if there is
no targets available, make the steed make some noise as feedback.

src/cmd.c

@@ -934,7 +934,7 @@ domonability(void)
     } else if (is_vampire(uptr) || is_vampshifter(&gy.youmonst)) {
         return dopoly();
     } else if (u.usteed && can_breathe(u.usteed->data)) {
-        (void) pet_ranged_attk(u.usteed);
+        (void) pet_ranged_attk(u.usteed, TRUE);
         return ECMD_TIME;
     } else if (Upolyd) {
         pline("Any special ability you may have is purely reflexive.");