Bug 37048: Use template wrapper for self checkout page

Bug 37048: Use template wrapper for self checkout page

This patch updates the OPAC's self checkout page template to use
WRAPPERs for the Bootstrap tabs markup.

To test, apply the patch and enable the "WebBasedSelfCheck" system
preference if necessary.

- Navigate to the self checkout page
  (http://127.0.0.1:8080/cgi-bin/koha/sco/sco-main.pl)
  - Start checking out to a patron
    - You should see three tabs, "Checkouts", "Holds", and "Charges."
      The tabs should look correct and work correctly.

Sponsored-By: Athens County Public Libraries
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>