Bug 30362: Fix GetSoonestRenewDate to really return soonest renew date

Bug 30362: Fix GetSoonestRenewDate to really return soonest renew date

This change fixes GetSoonestRenewDate so that it returns the soonest
renew date as calculated using "No Renewal Before" and "NoRenewalBeforePrecision".
In the past, it would only return the soonest renew date if "$now" was
lesser than it, which would typically only happen when using an "exact"
precision rather than a "date" precision.

Test plan:
0. Apply the patch
1. prove t/db_dependent/Circulation.t

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>