[FIX] crm: correctly compute phone_sanitized without having crm_sms installed

Currently phone_sanitized computation on lead model works only if crm_sms
is installed. Indeed an override of ``_phone_get_number_fields`` is missing.
However ``_sms_get_number_fields`` coming with ``crm_sms`` and its ``sms``
dependency hides the issue as those modules are auto-install. However if
``crm_sms`` is uninstalled phone_sanitized is not correctly computed anymore.

Task ID-2528169
Oversight of odoo/odoo#45315