Bug 11317: (follow-up) Add two-level entry to koha-conf and remove unwanted characters

Bug 11317: (follow-up) Add two-level entry to koha-conf and remove unwanted characters

- Removed merge marker
- Changed include path in favor of using the Asset tt plugin (bug 20538)
- Changed access_dir to a two-level entry for clarity

Test plans stay the same, just make sure that the two-level configuration entry
work properly and everything pass QA.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>