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

Closes #15734

missing code
(cherry picked from commit eac9c1f0b992fd3622fd7dd864b2acc2781ec778)

src/server/game/Entities/Player/Player.cpp

@@ -7983,7 +7983,7 @@ void Player::CastItemCombatSpell(DamageInfo const& damageInfo, Item* item, ItemT
             else if (chance > 100.0f)
                 chance = GetWeaponProcChance();
 
-            if (roll_chance_f(chance))
+            if (roll_chance_f(chance) && sScriptMgr->OnCastItemCombatSpell(this, damageInfo.GetVictim(), spellInfo, item))
                 CastSpell(damageInfo.GetVictim(), spellInfo->Id, item);
         }
     }