Due to the infamous web_editor revert, summernote assets filesa are once again created and stored in DB, but because they do not contain 'assets_' in their name, they would show up in the media dialog. This commit fixes that by prefixing the created summernote assets file with 'assets_' closes odoo/odoo#45298 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>