Dynamic (transient) material instance assignment lost if object spawnable

Material Instance Dynamic assigned to Spawnable objects with Editor Utility Widget get reverted when hit the Save button in Sequencer.

This appears to come from the Material Instance Dynamic not being copied to the template object in the function "MovieSceneHelpers::MakeSpawnableTemplateFromInstance(...)" from MovieSceneCommonHelpers.cpp.

1. Download the Licensee's test project and open
https://udn.unrealengine.com/s/contentdocument/069QP00000CZzMrYAL
2. Open the Level Sequence
“/Game/reprospawn/level_sequence/LS_reprospawn.uasset”
3. Observe all Sequence Static Meshes with WorldGrid Material assigned.
4. Run the Editor Utility Widget
“/Game/reprospawn/tools/EUW_assignMaterial.uasset”
5. In new Window click on AssignDynamicMat button
6. Observe Dynamic Material were assigned to Static Meshes in Sequencer
7. In Sequencer click on Save button
8. Observe Static meshes lost assigned Material Instances Dynamic and reverted back to WorldGrid Material.

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