Bug 12746 - Remove empty onclick attribute from memberentrygen.tt

Bug 12746 - Remove empty onclick attribute from memberentrygen.tt

This patch removes empty onclick attribute from memberentrygen.tt

To test:
Apply patch.
Use git grep 'onclick=""' to make sure that there are no more empty onlick attributes
Go to Home > patrons  and click 'New patron'
Check HTML of 'Cancel' link
Make sure that 'Cancel' link still works

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Changes the link to cancel adding a manual restriction.
No regressions found.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>