Don't drop aklys on the floor due to slippery fingers

Aklyses uniquely have a tether attached to one's wrist, which would stay
secure even when one's fingers are slippery. Therefore, it doesn't make
for the weapon to be dropped completely, tether and all, when Glib.

However, the game doesn't have a way to model a weapon that's on the
floor at your feet but still attached to your arm. (Technically the
uball and uchain code does do this sort of thing already, but it can't
be used here - what if you have an aklys slipping out of your grasp and
are punished at the same time?) So the next best thing is to give
aklyses immunity to slipping from one's hand.

src/do_wear.c

@@ -2421,7 +2421,7 @@ glibr(void)
             dropx(otmp);
     }
     otmp = uwep;
-    if (otmp && !welded(otmp)) {
+    if (otmp && otmp->otyp != AKLYS && !welded(otmp)) {
         long savequan = otmp->quan;
 
         /* nice wording if both weapons are the same type */