Merge pull request #329 from aws-lumberyard-dev/Atom/FixNonUnity

Add Scene.h header to fix non-unity build

Gem/Code/Source/MultiSceneExampleComponent.h

@@ -16,6 +16,7 @@
 #include <AzCore/Asset/AssetCommon.h>
 #include <AzCore/Component/TickBus.h>
 
+#include <AzFramework/Scene/Scene.h>
 #include <AzFramework/Windowing/WindowBus.h>
 #include <AzFramework/Windowing/NativeWindow.h>