pull: ensure we can still pull exports
pull: ensure we can still pull exports

Updates https://github.com/odeke-em/drive/pull/735.

Ensure that we can still pull exports after a body
fetch for exports was accidentally taken out.

gccpacman/drive,Dedsec01/drive,gdm85/drive,odeke-em/drive,odeke-em/drive,gdm85/drive,gccpacman/drive,Dedsec01/drive