[FIX] crm: always display UTM information on opportunity view

This commit fixes the crm.lead form view to always display UTM information when
the lead is of type "opportunity".

Before this change, the UTM information (as well as the 'referred' field) were
only displayed for members of the 'base.group_multi_company', which did not
make sense on a functional point of view.

The 'company_id' field however, that is in the same form group, is still
correctly displayed only for members of the 'base.group_multi_company' group.

Task 2237318

closes odoo/odoo#50290

X-original-commit: 69bbe848f50a80f215cf42f619e2128e9302ba0f
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Signed-off-by: awa-odoo <awa-odoo@users.noreply.github.com>