Bug 23808: (follow-up) Pre-fill guarantee's contact details from guarantor patron...

Bug 23808: (follow-up) Pre-fill guarantee's contact details from guarantor patron in memberentry.pl

Pre-fill guarantee contact details (email, phone) from guarantor record
when adding a gurantee to a guarantor's record

Test plan:

1. Apply first two patches and follow test plans
2. On an adult's patron record (which has an primary phone number, secondary
   phone, other phone, primary email, secondary email and fax set) select
   'Add a guarantee' and observe the guarantee's 'Contact' section is not
   pre-filled with that information from the guarantor
3. Apply this patch
4. On the same adult's record select 'Add a guarantee' and observe that the
   'Primary phone', 'Secondary phone', 'Other phone', 'Primary email',
   'Secondary email', 'Fax' have been pre-filled from the guarantor's record
5. Fill out the rest of the memberentry.pl and 'Save' and observe that those
   contact details are successfully saved
6. Repeat step 4 and alter the 'Primary phone' and 'Primary email'
   fields and save and observe that those altered values are saved
7. Run tests and confirm they pass:
   sudo koha-shell <instancename>
   prove xt
   prove t

Sponsored-by: South Taranaki District Council, NZ
Signed-off-by: Andreas Roussos <a.roussos@dataly.gr>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>