BUG Prevent SelectUploadField breaking AssetAdmin

If the DI instructions are followed as per the documentation then the injected field interferes with AssetAdmin by ignoring the current folder.

This fix ensures that if a custom template is included without the folder selector, then it behaves as though the folder selector is disabled.
Yes, but then we add more and more API. Do you think that a small hack is less elegant than a large one?

I will make another option then.