use subject's uploading project as fallback for talk (#5446)
use subject's uploading project as fallback for talk (#5446)

if we can't determine the URL context for a talk board, then fallback to the subjects' uploading project context, do not use the collection context as it is missing project links for collections originally created in a project talk context but then used to collect subjects across the zooniverse. I.e. the collection project link was only set on create and not when adding subjects in other project contexts
zooniverse/Panoptes-Front-End