Open Formats: FBX Reimport - Reimport settings for FBX not getting stored

FBX assets originally imported in 5.7 lose their "Combine Static Meshes" import setting when reimported in 5.8. In 5.8 "Combine Static Meshes" was changed from a bool to 3-way enum, and the old bool choice from 5.7 is not moved into the 5.8 enum. The result for end users is that reimport fails in 5.8. I beleive the issue would also affect `bImportCollision_DEPRECATED`

1. In 5.7 fbx interchange importer
2. Import "MyCubes.fbx" with `Combine Static Meshes` set to True
3. Open the same project in 5.8
4. Open the "Reimport with Dialog" options in 5.8
5. Observe that the `Combine Static Meshes` is set to "Do Not Combine Static Meshes"
6. Expected that it would be set to "Combine All"

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