Bug 23158: keep on-site checkout info when using itemBarcodeFallbackSearch

Bug 23158: keep on-site checkout info when using itemBarcodeFallbackSearch

When using preference itemBarcodeFallbackSearch one can enter a search term instead of a barcode in checkout form.
If on-site is selected this should be transmitted to itemBarcodeFallbackSearch form.

Test plan :
1) Enable system preferences "itemBarcodeFallbackSearch" and "OnSiteCheckouts"
2) Disable system preference "ConsiderOnSiteCheckoutsAsNormalCheckouts"
3) Go to a patron circulation page
4) Check "On-site checkout" in "Checkout settings"
5) Enter a barcode in checkout form and click on "Check out"
6) You see the checkout in table with red "(On-site checkout)"
7) Check "On-site checkout" in "Checkout settings"
8) Enter the title of a record in in checkout form and click on "Check out"
9) Click on "Checkout" on a line
10) You see the checkout in table with red "(On-site checkout)"

Signed-off-by: Arthur Bousquet <arthur.bousquet@inlibro.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>