Fix dancing weapon interactions under Gozag (#9856)

Temporary dancing weapons (created by Tukima's Dance) just drop the weapon
itself, so as not to give free gold by casting the spell on monsters. Permanent
dancing weapons still turn into gold like other monsters, and now no longer
drop the weapon at the same time.

crawl-ref/source/mon-death.cc

@@ -408,9 +408,14 @@ item_def* place_monster_corpse(const monster& mons, bool silent, bool force)
     }
 
     // Under Gozag, monsters turn into gold on death.
+    // Temporary Tukima's Dance weapons stay as weapons (no free gold),
+    // permanent dancing weapons turn to gold like other monsters.
     bool goldify = in_good_standing(GOD_GOZAG)
-        && mons_class_gives_xp(mons.type) && !mons_is_conjured(mons.type)
-        && !force;
+                   && mons_class_gives_xp(mons.type)
+                   && !mons_is_conjured(mons.type)
+                   && !force
+                   && !(mons.type == MONS_DANCING_WEAPON
+                        && mons.has_ench(ENCH_ABJ));
 
     const bool no_coinflip =
         mons.props.exists("always_corpse")
@@ -1943,7 +1948,10 @@ item_def* monster_die(monster* mons, killer_type killer,
 
         if (!silent && !hard_reset && !was_banished)
         {
-            if (!summoned_it)
+            // Under Gozag, permanent dancing weapons get turned to gold.
+            if (!summoned_it
+                && (!in_good_standing(GOD_GOZAG)
+                    || mons->has_ench(ENCH_ABJ)))
             {
                 simple_monster_message(mons, " falls from the air.",
                                        MSGCH_MONSTER_DAMAGE, MDAM_DEAD);