[FIX] website_blog: do not sanitize blog content field
[FIX] website_blog: do not sanitize blog content field

Fixes commit https://github.com/odoo/odoo/commit/02c748be59ac8abc44c945218587e7b8a8e06a28:
Blog content field should not have been marked for any sanitization at
all as it is a field whose content is editable only by users through the
website editor. Any content should be authorized there. In particular,
some snippets contain form elements (like <input/> tags) which are
never accepted during sanitization.

opw-752458

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo