Bug 31829: Fix change password form alignment

Bug 31829: Fix change password form alignment

This patch gives the fieldset on member-password.tt the class row. It also moves the hints below the list.

To test:
1. Apply patch
2. Pull up a patron record and go to 'Change password'.
3. Make sure the form now looks good.
4. Also check and make sure the form is still functional.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>