Merge pull request #2920 from Chaplain/cleanup

Core/Auras: Improvements in SPELL_AURA_MOD_DAMAGE_PERCENT_DONE handling: 
* Weapon specific case for MOD_DAMAGE_DONE_PCT shouldn't change PLAYER_FIELD_MOD_DAMAGE_DONE_PCT, because PLAYER_FIELD_MOD_DAMAGE_DONE_PCT applyed for _all_ damage that deal target.
* Fixed applying SPELL_AURA_MOD_DAMAGE_PERCENT_DONE for SpellDamageBonus.

src/server/game/Spells/Auras/SpellAuraEffects.cpp

@@ -4522,7 +4522,7 @@ void AuraEffect::HandleModDamagePercentDone(AuraApplication const* aurApp, uint8
     }
     else
     {
-        // done in Player::_ApplyWeaponDependentAuraMods for !SPELL_SCHOOL_MASK_NORMAL and also for wand case
+        // done in Player::_ApplyWeaponDependentAuraMods for SPELL_SCHOOL_MASK_NORMAL && EquippedItemClass != -1 and also for wand case
     }
 }