Bug 19784: Remove reference to 'borrowernumber' param from other endpoints

Bug 19784: Remove reference to 'borrowernumber' param from other endpoints

This patch removes the $ref occurences for borrowernumber in not
patron-specific endpoints. 'borrowernumber' is still used on them, but as a
hardcoded parameter. The param rename will happen on a separate bug for
each endpoint.

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>