[FIX] website: allow user to access HTML/CSS editor

Current behavior:
When an admin user modified a file with the HTML/CSS/JS editor in a
website, users that had "editor and designer" right couldn't access
the HTML/CSS/JS editor anymore.

Steps to reproduce:
- Have user 1 (U1) admin
- Have user 2 (U2) with website access set to "Editor and Designer"
- U1 modify the css user_custom_rules.scss with the HTML/CSS Editor
- U2 can't open the editor of that website because he is not in the
setting groups or the one that created it

opw-2733109

closes odoo/odoo#88920

X-original-commit: b0d39dff
Signed-off-by: Romain Derie (rde) <rde@odoo.com>
Co-authored-by: roen-odoo <roen@odoo.com>