Bug 29591: Add autorenew_checkouts column to preferences json

Bug 29591: Add autorenew_checkouts column to preferences json

Bug 24476 added autorenew_checkouts as a borrower column, intending it to be able to be
hidden if a library was not using the feature.

When the column chooser was added, this column was not included.

To test:
1 - Search system preferences for "BorrowerUnwantedFields"
2 - Click the box to change the value
3 - "autorenew_checkouts" is not an option
4 - Confirm that you see the option to opt patron out of autorenewal when editing patron on staff side
5 - Apply patch and restart everythign
6 - Search for the syspref again
7 - Note that now you can select "autorenew_checkouts"
8 - Check the box and save
9 - Confirm the opt out option is no longer visible during patron editing

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>