Bug 8683: ensure clear button clears all item fields on order form

Bug 8683: ensure clear button clears all item fields on order form

The clear js function parses input text, but input filled to a plugin
does not contain the type attribute.

Test plan:
- fill the barcode field to the barcode plugin
- go on the new order page
- verify the barcode plugin works as before
- verify the clear link clears the barcode field and all others fields.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as expected, passes all tests and QA script.
Template change only.
Barcode and date acquired are now also cleared with the
'clear' link.

But: it only works when you enter a barcode manually currently,
because the AutoBarcode functionality is broken on master (bug 11273).

Signed-off-by: Galen Charlton <gmc@esilibrary.com>