Bug 10419: (follow-up) tidy names of command-line switches

Bug 10419: (follow-up) tidy names of command-line switches

[1] Use --library instead of --branchcode to be consistent
    with other scripts and user-facing Koha terminology.
[2] Use --not_borrowed_since instead of --not_borrowered_since;
    no need to expose typos in the API to the user.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>