Using Square Brackets in a Folder Name Works but makes Meshes Unusable.

Renaming a folder using square brackets seems to work but renders meshes inside unusable in certain instances. 

1. Create a new blank project with starter content
2. Rename the Props folder to [Props]
3. Make a new actor Blueprint
4. Add a static mesh component
5. Try setting the static mesh to any mesh within the renamed [Props] folder using the details panel

Results: Nothing will happen upon selecting the mesh.

Expected: The mesh should get selected or you should not be allowed to use square brackets in the folder name.

Fix UE-51650

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