Makes file preview work with search results

closes CNVS-16001

Test Plan:
  - Start new files up (better file browsing)
  - Search for something.
  - Open the preview for a file.
  - Navigation with keyboard or clicking the arrows should
    stay within the search results
  - Closing preview should stay on the search results.

  Note: Selection of multiple files is another ticket... and
       will be addressed with it (CNVS-15993)

Change-Id: I5b199619fa2939e8ca59de142c71fcce2a90b26f
Reviewed-on: https://gerrit.instructure.com/42255
Reviewed-by: Ryan Shaw <ryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Jahnavi Yetukuri <jyetukuri@instructure.com>
Product-Review: Cosme Salazar <cosme@instructure.com>