Core/Spells: Fixed power burn effects showing mana restored to caster

Closes issue #4078.

--HG--
branch : trunk

src/server/game/Spells/SpellEffects.cpp

@@ -2150,9 +2150,10 @@ void Spell::EffectPowerBurn(SpellEffIndex effIndex)
     // NO - Not a typo - EffectPowerBurn uses effect value multiplier - not effect damage multiplier
     float dmgMultiplier = SpellMgr::CalculateSpellEffectValueMultiplier(m_spellInfo, effIndex, m_originalCaster, this);
 
-    newDamage = int32(newDamage * dmgMultiplier);
+    // add log data before multiplication (need power amount, not damage)
+    ExecuteLogEffectTakeTargetPower(effIndex, unitTarget, powerType, newDamage, 0.0f);
 
-    ExecuteLogEffectTakeTargetPower(effIndex, unitTarget, powerType, newDamage, dmgMultiplier);
+    newDamage = int32(newDamage * dmgMultiplier);
 
     m_damage += newDamage;
 }