Bug 27600: Remove password check from SIP2 `renew_all`

Bug 27600: Remove password check from SIP2 `renew_all`

This patch removes the password check code from the renew_all method for
SIP2. This is required, as many units send an empty AD field in the SIP
message which can cause the transaction to fail.. but the authentication
should have already taken place earlier in the session.

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