don't use default image/jp2 mimetype if remote image

Signed-off-by: Sebastian Schüpbach <sebastian.schuepbach@unibas.ch>
2 jobs for master in 1 minute and 44 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #66514
mbr
test

00:00:31

 
  Publish
passed #66515
mbr
build-latest-image

00:01:13