ArchivesSpace: fix add child
ArchivesSpace: fix add child

Signed-off-by: Misty De Meo <6ed20103e96b5a7be245b286647c926ed16c329e@artefactual.com>

djpillen/appraisal-tab,eckardm/appraisal-tab,artefactual-labs/appraisal-tab,artefactual-labs/appraisal-tab,djpillen/appraisal-tab,eckardm/appraisal-tab