Bug 10860: Follow-up - fix some template variable issues

Bug 10860: Follow-up - fix some template variable issues

Fixing some simple display issues caused by missing/misnamed
variables, probably consequence of the renaming before.

Amended test plan:
- Make sure that if OnSiteCheckoutsForce is set, you can
  still perform onsite checkouts and only those.
- Check the detail page in staff says *currently in local use by*
  for an on-site checked out item
- Check the detail page in OPAC with OPACShowCheckoutName active
  for the same.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>