Allow nurses heal attack when wielding a non-weapon/weaptool

This matches the nurses' hitting behavior with their chatting messages.

Chatting to them suggested that the heal attack would happen but the check in
mhitu.c was just for wielding anything.

This opens up the possibility of a YAFM in MS_NURSE when wielding something
that allos the heal attack to proceed.  But I couldn't come up with a good
one.

doc/fixes37.0

@@ -157,6 +157,7 @@ monster or object detection found semi-dead vault guard at <0,0> while
 	monsters on level; likewise object detection and guard's minvent
 squadprob[] in mkroom.c was defined with 5 elements but initialized only 4
 	resulting in giant ants sometimes
+allow nurses heal attack when wielding a non-weapon/weaptool
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

src/mhitu.c

@@ -1508,7 +1508,9 @@ register struct attack *mattk;
             hitmsg(mtmp, mattk);
             break;
         }
-        if (!uwep && !uarmu && !uarm && !uarmc
+        /* weapon check should match the one in sounds.c for MS_NURSE */
+        if (!(uwep && (uwep->oclass == WEAPON_CLASS || is_weptool(uwep)))
+            && !uarmu && !uarm && !uarmc
             && !uarms && !uarmg && !uarmf && !uarmh) {
             boolean goaway = FALSE;