Bug 21867: Replace remaining document.element.onchange calls in marc_modification_tem...

Bug 21867: Replace remaining document.element.onchange calls in marc_modification_templates.js

Replace onchange() by jQuery change().

Test plan:
Go to marc mod templates. Add, edit and delete. Check if works and no js
errors.
git grep -l -E "onchange\(" should not have occurrences outside lib.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Andreas Roussos <arouss1980@gmail.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>