Core/Spells: Remove movement impairing effects for druids when shifting back to normal form

fixes #320

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

@@ -3174,7 +3174,11 @@ void AuraEffect::HandleAuraModShapeshift(AuraApplication const * aurApp, uint8 m
         {
             target->SetShapeshiftForm(FORM_NONE);
             if (target->getClass() == CLASS_DRUID)
+            {
                 target->setPowerType(POWER_MANA);
+                // Remove movement impairing effects also when shifting out
+                target->RemoveMovementImpairingAuras();
+            }
         }
 
         if (modelid > 0)