fix completed submitters

app/controllers/api/submissions_controller.rb

@@ -74,8 +74,8 @@ module Api
       Submissions.send_signature_requests(submissions)
 
       submissions.each do |submission|
-        if submission.submitters.all?(&:completed_at?) && submission.submitters.last
-          ProcessSubmitterCompletionJob.perform_async({ 'submitter_id' => submission.submitters.last.id })
+        submission.submitters.each do |submitter|
+          ProcessSubmitterCompletionJob.perform_async({ 'submitter_id' => submitter.id }) if submitter.completed_at?
         end
       end