Bug 24201: (follow-up) Use GetLoggedInDeskName

Bug 24201: (follow-up) Use GetLoggedInDeskName

This patch updates the templates to use the new TT plugin instead of
adding additional variables to the already crouded get_template_and_user.

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>

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