Bug 29524: (bug 28935 follow-up) Restore modification of some patron's attributes

Bug 29524: (bug 28935 follow-up) Restore modification of some patron's attributes

On
  commit 5f37d8d2f496ce3c9fd6dfd5a2efa7a9fe435af3
  Bug 28935: No filtering on patron's data on member entry pages
we restricted the list of the columns from the borrowers table that can
be modified from the patron edit view.
We were too restrictive, the following 3 attributes can be edited from
this form: privacy_guarantor_fines, privacy_guarantor_checkouts,
checkprevcheckout and lang

Test plan:
Turn on the following prefs:
- AllowStaffToSetFinesVisibilityForGuarantor
- AllowStaffToSetCheckoutsVisibilityForGuarantor
- CheckPrevCheckout (set to 'unless overridden *')
- TranslateNotices
Edit a patron and see the 4 different options are now displayed.
Change their value, save, edit again
Confirm that the values have been saved

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>