[FIX] event_sms: check model of sms template

When notification type is set as sms we need to check whether the template
which is referenced is coming from a correct model or not.

Applying this commit will fix this issue.

sentry-4195133685

closes odoo/odoo#125709

X-original-commit: 6cb268230cab571fe39ee755b06b24a2a3cd5579
Related: odoo/enterprise#42827
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Signed-off-by: Saurabh Choraria (sauc) <sauc@odoo.com>