Download original file

Modify download on dev_4_4 before applying changes on develop see https://trac.openmicroscopy.org.uk/ome/ticket/8188

Test 1:
 * Import an image, select archive at import
 * Select the Download option on the right-hand side
 * Download the image

Test 2:
 * Import an image composed of several files, select archive at import
 * Select the Download option on the right-hand side
 * Download the image

Test 3:
 * Import an image, DO NOT select archive at import
 * Select the Download option on the right-hand side
 * Download the image. No result returned, A message indicating to download as OME-TIFF should be displayed