[IMP] codeowners: target python files only for SM team

closes odoo/odoo#60336

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

.github/CODEOWNERS

@@ -44,16 +44,16 @@
 
 /addons/http_routing/ @odoo/rd-website
 
-/addons/im_livechat/ @odoo/rd-discuss @odoo/rd-sm
+/addons/im_livechat/ @odoo/rd-discuss
 
 /addons/mail/ @odoo/rd-discuss
 /addons/mail/**/*.py @odoo/rd-discuss @odoo/rd-sm
-/addons/mail/models/ir_http.py @odoo/rd-discuss @odoo/rd-sm @odoo/rd-website
+/addons/mail/models/ir_http.py @odoo/rd-discuss @odoo/rd-website
 
 /addons/mail_bot/ @odoo/rd-discuss
 /addons/mail_bot/models/ir_http.py @odoo/rd-discuss @odoo/rd-website
 
-/addons/mass_mailing/ @odoo/rd-sm
+/addons/mass_mailing/**/*.py @odoo/rd-sm
 
 /addons/portal/ @odoo/rd-images
 /addons/portal/models/ir_http.py @odoo/rd-website