Fix loop for images
Fix loop for images

When an image was added to the synchronized folder, both sides tried to
update it in a loop:

- remote -> local, because cozy creates thumbnails for the image
- local -> remote, because cozy-desktop update the lastModification
  with `fs.utimes` and it as the side effect to also update the
  creationDate.

Cozy-desktop now preserve the creationDate, which breaks the loop.

cozy-labs/cozy-desktop,nono/cozy-desktop,kosssi/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop