Add missing API filters to batch editing

@tiwane See also the feature request https://forum.inaturalist.org/t/batch-edit-submissions-to-a-project/6063 which you closed in Sep 2019. You said “we may not make any changes to the Edit Observations page until it’s totally revamped”, but I can’t find any open forum topic that discusses plans for the revamp of that page. Did I overlook something? Are there plans, and if so, is there any public discussion of those plans that you can link to?