As the `color-contrast` function provided by BS5 basically fulfill the same need as the custom `o-get-most-contrast` function and the later one isn't used, we can safely remove the custom one. closes odoo/odoo#96626 Note: last (and only) usage was in mrp_workorder's tablet view. Related: odoo/enterprise#29802 Signed-off-by: Samuel Degueldre <sad@odoo.com>