Bug 26069: Pass correct URL to twitter

Bug 26069: Pass correct URL to twitter

We don't provide the url of the detail page so the twitter JS code
retrieve the current location, with the search terms.

Test plan:
Do a search
Click on a result
Click on the twitter button and confirm that the link only contain
biblionumber=x in the parameter

Signed-off-by: Amit Gupta <amit.gupta@informaticsglobal.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>