Bug 26039: Focus and Scroll to ShelfBrowser on load

Bug 26039: Focus and Scroll to ShelfBrowser on load

When the shelf browser link is clicked we perform a full page reload
which results in a reset in the context. We should immediately focus the
shelf browser and scroll to that region to highlight the change of
content.

Test plan
1/ Enable shelf browser
2/ Search for an item in the open and navigate to the detail page
3/ Click the 'Browse shelf' link
4/ Note that upon page reload the screen scrolls to the 'Browsing...'
location of the screen.
5/ Note that the 'Browsing...' title is  'focused'
6/ Signoff.

Signed-off-by: Stina Hallin <stina.hallin@ub.lu.se>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
JD amended patch: correctly align JS code

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>