polymorph dropping in-use wielded leash

From a bug report, if you polymorph into
something, like a killer bee, that causes you to drop your weapon, but the
weapon is a wielded, in-use leash, the leash would be dropped but retain
it's in-use state.  However, the leash was tied to you, so it seems it
should remain attached, just unwielded, just as it would if it hadn't been
wielded.  I've changed the behavior to do this.  I wonder whether one
should be able to wield an in-use leash.

doc/fixes34.4

@@ -320,6 +320,7 @@ cursed corpse wielded by a monster isn't welded to its hand or paw
 fix grammar errors in samurai quest, wakarimasu ka?
 fix spelling of Dr Dolittle
 hero's sleep resistance shouldn't protect steed from sleeping gas trap
+dropped wielded, in use leash should remain in inventory, since it's in-use
 
 
 Platform- and/or Interface-Specific Fixes

src/polyself.c

@@ -736,7 +736,8 @@ int alone;
 			   	u.twoweap ? "s" : "");
 	    otmp2 = u.twoweap ? uswapwep : 0;
 	    uwepgone();
-	    if (!wep->cursed || wep->otyp != LOADSTONE)
+	    if ((!wep->cursed || wep->otyp != LOADSTONE) &&
+		(wep->otyp != LEASH && wep->leashmon != 0))
 		dropx(otmp);
 	    if (otmp2 != 0) {
 		uswapwepgone();