Full Scene Importer resets overrides when reimporting asset

When using the Blueprint Hiearchy Type for creation on the Full Scene Importer if you've previously imported and set some of the settings like the Override Lightmap Resolution via the BP and then reimport these will be overwritten rather than keeping this value set.

1. Use the Full Scene Import via the File menu in the editor
2. Select a scene and set the Hierarchy Type "Create One Blueprint Asset"
3. Open the BP and set any of the SMs to have an overridden Lightmap.
4. Go back to the FBX Scene Import Data asset in the Content Browser and right-click > Reimport

Regression: No

Results: The overridden lightmap resolution has reset even though this was supposed to be a reimport and not an overwriting the original import.

Expected: Should not overwrite the overridden setting.

Fix UE-51650

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