[FIX] web: remove duplicated entry in field_registry
[FIX] web: remove duplicated entry in field_registry

Commit 4960453d added the field signature in field_registry.js and
in signature.js.

closes odoo/odoo#31434

Signed-off-by: =?utf-8?b?R8OpcnkgRGVib25nbmllIChnZWQp?= <767e387ec22b285e8a981c348a6e0620992d4a93@openerp.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo