Bug 7888 - Permission for "change password" button in circ toolbar should be "borrowe...

Bug 7888 - Permission for "change password" button in circ toolbar should be "borrowers" instead of "staffaccess"

Patch changes permisison for "change password" button in circ-toolbar.inc from staffaccess to borrowers.

To test:
- With a staff user with borrowers permission, verify the change password button is shown for a normal patron.
- With a staff user without borrowers permission, verify the change password button does not appear.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>