[FIX] sms: fix recipient of SMS wizard

Prior to this commit, the recipient in the SMS wizard
shows The name of the record.

In this commit, we make the partner the recipient instead
showing The name of the record itself.

task-3000243

closes odoo/odoo#110707

X-original-commit: 16e25eda
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>