Bug 15094: Update link to Windows Offline Circ

Bug 15094: Update link to Windows Offline Circ

This patch updates the link on the main circulation
page to point to the newest release of the offline
circulation tool.

To test:

* Go to Circulation
* Click 'Get desktop application'
* Confirm the link goes to github

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Link Ok
No errors

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>