Core/Scripts: fix Nightfall proc chance and reduce it for victims with level above 60

Closes #15734

(cherrypicked from eac9c1f0b9)

src/server/game/Scripting/ScriptMgr.cpp

@@ -1685,6 +1685,17 @@ bool ScriptMgr::OnItemRemove(Player* player, Item* item)
     return tmpscript->OnRemove(player, item);
 }
 
+bool ScriptMgr::OnCastItemCombatSpell(Player* player, Unit* victim, SpellInfo const* spellInfo, Item* item)
+{
+    ASSERT(player);
+    ASSERT(victim);
+    ASSERT(spellInfo);
+    ASSERT(item);
+
+    GET_SCRIPT_RET(ItemScript, item->GetScriptId(), tmpscript, true);
+    return tmpscript->OnCastItemCombatSpell(player, victim, spellInfo, item);
+}
+
 bool ScriptMgr::OnDummyEffect(Unit* caster, uint32 spellId, SpellEffIndex effIndex, Creature* target)
 {
     ASSERT(caster);