Convert Actor option is grayed out and not selectable. (ConversionRoot metadata not found)

The 'Convert Actor' option in the details tab of brushes does not function. The option is grayed out and not selectable.

Note for Core: This button works by looking for the ConversionRoot UCLASS macro flag. It gets turned into metadata by the header parser. That is not working for some reason even though the code is there in HeaderParser.cpp

1. Open the latest UE4-UT editor sync with 'UnrealTournament -log' in the target.
2. Open any map.
3. Place a BSP brush in the level.
4. In the details tab for the brush, attempt to use the 'Convert Actor' option.

Result:
The option to convert the actor is not selectable, therefor cannot be used.

Fix UE-51650

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