Core/Auras: calculate periodic bonuses before specific mods, fixes Imp. Devouring Plague damage

(cherry picked from commit bd49d37258a467b7b8dc98a3454b6079ecd9b3b6)

src/server/game/Entities/Unit/Unit.cpp

@@ -3296,8 +3296,8 @@ void Unit::_ApplyAura(AuraApplication * aurApp, uint32 effMask)
     if (aurApp->GetRemoveMode())
         return;
 
-    aura->HandleAuraSpecificMods(aurApp, caster, true, false);
     aura->HandleAuraSpecificPeriodics(aurApp, caster);
+    aura->HandleAuraSpecificMods(aurApp, caster, true, false);
 
     // apply effects of the aura
     for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)

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

@@ -923,11 +923,13 @@ void Aura::SetStackAmount(uint8 stackAmount)
             effect->ChangeAmount(effect->CalculateAmount(caster), false, true);
 
     for (std::list<AuraApplication*>::const_iterator apptItr = applications.begin(); apptItr != applications.end(); ++apptItr)
+    {
         if (!(*apptItr)->GetRemoveMode())
         {
-            HandleAuraSpecificMods(*apptItr, caster, true, true);
             HandleAuraSpecificPeriodics(*apptItr, caster);
+            HandleAuraSpecificMods(*apptItr, caster, true, true);
         }
+    }
 
     SetNeedClientUpdateForTargets();
 }