Bug 14841: Columns settings are not taken into account for checkout table / moremember

Bug 14841: Columns settings are not taken into account for checkout table / moremember

There is a typo member vs members in the template when retrieving the
existing settings.
So that all columns are displayed, even the ones which are hidden
(sort_order, due_date_unformatted, etc.)

Test plan:
0/ Does not apply this patch
1/ Go on the columns config page and check some fields not to display by
default for Patrons > moremember > issues-table
2/ Go on the patron detail page (with checkouts), click on the "show/hide
columns" button (top right of the table).
Confirm that the config is not taken into account and that it's ugly
(hidden columns are displayed)
3/ Apply this patch
4/ Everything should be fine now :)

Signed-off-by: Joonas Kylmälä <j.kylmala@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>