Added missing #pragma once

Signed-off-by: Norbert Prokopiuk <[email protected]>

Gems/SimulationInterfaces/Code/Tests/Tools/TestFixture.h

@@ -6,6 +6,7 @@
  * SPDX-License-Identifier: Apache-2.0 OR MIT
  *
  */
+#pragma once
 
 #include <AzCore/Asset/AssetManagerComponent.h>
 #include <AzCore/Component/ComponentApplication.h>