Core/Spells: Fixed "not handled custom case" log spam for Sniper Training

--HG--
branch : trunk

src/server/scripts/Spells/spell_hunter.cpp

@@ -357,6 +357,7 @@ public:
 
         void HandlePeriodic(AuraEffect const * aurEff, AuraApplication const * aurApp)
         {
+            PreventDefaultAction();
             if (aurEff->GetAmount() > 0)
                 return;