Bug 29504: Allow 'ADDITIONAL_MATERIALS' check to be confirmed

Bug 29504: Allow 'ADDITIONAL_MATERIALS' check to be confirmed

The additional materials check when CircConfirmParts is enabled was
errantly relying upon the 'FORCE_CHECKOUT' permission.  This patch
updates the template to allow confirmation as well as cancellation of
chekout.

Test plan
1. Set a staff member with circ permissions, but not FORCE_CHECKOUT
2. Turn on CircConfirmItemParts
3. Log in as staff member in step 1
4. Attempt to checkout an item with a 952$3
5. The only option given is the Continue button (with a red X) and when
   clicked, the item does not get checked out.
6. Apply patch
7. Repeat step 4.
8. You should now have the option to 'Yes, check out (Y)' or
   'No, don't check out (N)'

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>