message: fix: match date/time format for submission creation timestamp
diff: <div data-test-submissions-list-item-author>{{submission.authorName}}</div>
  <div data-test-submissions-list-item-category>{{submission.category}}</div>
  <div data-test-submissions-list-item-date>
  - {{moment-format submission.created 'MMM DD, YYYY'}}
  + {{moment-format submission.created 'YYYY-MM-DD hh:mm A'}}
  </div>
  <div data-test-submissions-list-item-download>
  <OsfButton @type='success' class='btn-xs' @onClick={{action this.downloadFile submission}}>
  