Bug 36481: (follow-up) Add missing library_id parameter

Bug 36481: (follow-up) Add missing library_id parameter

The /libraries/{library_id}/cash_registers endpoint was missing the
library_id parameter definition from the swagger specification.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 466d38f18d43e968f3b69562c1ee018177953681)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit ec208128525d42b97a6d1fd390ca78c1f88e8856)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>