HideCategories() property is not held when the editor is closed

Setting a UCLASS() macro with the "HideCategories" property will updated after a hot reload but after closing /reopening the editor the hidden category will be visible again.

1. Open UE4Editor (any project
2. Add code to project based on actor (MyActor)
3. Create blueprint based on MyActor and add to the scene
4. In VS, add HideCategories=(Actor, Input, Rendering, Transform) inside the UCLASS() macro of the header file
5. Compile (the categories are hidden in editor after the hot reload)
6. Save and close the editor
7. Reopen project and select the blueprint in the level

Result: Categories are now visible again when the blueprint is selected.

Fix UE-51650

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