[FIX] web: prevent footer linebreak.
[FIX] web: prevent footer linebreak.

The purpose is, prevent the linebreak in the phone when using the
document layouts 'background' in the footer.

opw-1920752

closes odoo/odoo#30812
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo