fix U242 - bug with monks

Monks get a big penalty to hit when wearing a suit; otherwise they
get a bonus when not wielding a weapon.  But as reported, that lets them
have their martial arts bonus even while wearing a shield which does seem
rather unexpected.  This change makes them only get their to-hit bonus
while shieldless as well as weaponless.  Impact on play balance is likely
to be quite small; late game characters hardly ever miss due to high luck
bonus and very early game ones won't have found a shield yet.

     Shouldn't the "your armor is cumbersome" message be ``if (verbose)''?

src/uhitm.c

@@ -268,8 +268,9 @@ register struct monst *mtmp;
 	    if (uarm) {
 		Your("armor is rather cumbersome...");
 		tmp -= urole.spelarmr;
-	    } else if (!uwep)
+	    } else if (!uwep && !uarms) {
 		tmp += (u.ulevel / 3) + 2;
+	    }
 	}
 
 /*	with a lot of luggage, your agility diminishes */