don't explicitly request the "pseudofields"

[wibeasley]

Starting around REDCap v13.4.10, "pseudofields" (using @grezniczek's term) cannot be requested explicitly. I'll add something to REDCapR that removes these from the parameter so a user's code don't need to change.

REDCap admins can read more about this at

• https://redcap.vanderbilt.edu/community/post.php?id=203708
• https://redcap.vanderbilt.edu/community/post.php?id=203625

I don't think this is related to #474.