Bug 14571: HTTPS Amazon images [follow up]

 Bug 14571: HTTPS Amazon images [follow up]

I found a couple more places where we should be using images-na, so I
updated them

* in the shelf browser
* in XISBN related works (honestly not sure how to test this one, but
  changing from the http:// url won't hurt anything.)

To test:

* Turn on the shelf browser, and browse for an item that has an amazon
  image,
* inspect it, it should be using https://images-na... url.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>