[FIX] *: minor settings spacing issues

The purpose of this commit is to review the responsiveness and spacing
of some settings that were visually broken.

The nested checkboxes were growing too much on smaller screens
making the content overflow.

This commit adapts these checkboxes settings to make them more readable
and consistent.

Task-3113372

closes odoo/odoo#108902

Related: odoo/enterprise#35323
Signed-off-by: Tiffany Chang <tic@odoo.com>