Map Build Data Registry node not visible after building lighting

When the user builds lighting on a level, the Map Build Data Registry node is marked dirty, but isn't visible to the user initially. Selecting the filters dropdown, checking and unchecking a filter will make the node visible in the content browser.

1. Open Content Examples
2. Open Material_Nodes (I picked this because it hasn't had lighting rebuilt yet)
3. Rebuild lighting
4. Save the level after lighting has rebuilt
5. Close the editor
   RESULT: The user is prompted to save the "Map Build Data Registry," but the node is not visible in the viewport.
   WORKAROUND: If the user clicks the filter dropdown, checkes/unchecks a filter, the node is then visible in the editor

Fix UE-51650

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