Bug 35306: Fix Expired holds when modding request

Bug 35306: Fix Expired holds when modding request

To test:
1. Make some holds on a record and make sure some are set to expired.
2. Go to to reserve/request.pl?biblionumber=X for the biblionumber
3. Try updating something besides the expiration date. i.e. Pickup library
4. Click Update hold(s)
5. Notice the expirated holds have lost their expiration date.
6. APPLY PATCH
7. Try steps 2-4 again, this time the expiration date shold be retained.
8. Make sure Table settings still work and you can properly hide columns.
9. The hold expiration date should be hide-able.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>