Destructibles cannot reassign mesh in Level details panel if a Blueprint

Blueprints with a Destructible Mesh component cannot have the mesh changed via the level details panel. It will not accept any new mesh via selection or dragged onto the slot. The Blueprint itself exhibits this behavior as well.

1. Have two Destructible Meshes in your project for testing
2. Create a Blueprint with one of the meshes
3. Add the Blueprint to your level
4. Select the Blueprint and in the details panel under the DM Component assign any other DM

Regression: No

Results: The DM component in the level details panel cannot switch out its DM mesh.