mail_notifier: Added config option sender_name.

mail_notifier/notifier

@@ -34,7 +34,7 @@ create_msmtp_config() {
 }
 
 use_turris_smtp() {
-        mail_from="$(echo $mail_from | cut -d '@' -f1)@notify.turris.cz"
+        mail_from="$(uci get user_notify.smtp.sender_name | cut -d '@' -f1)@notify.turris.cz"
         local username=`atsha204cmd serial-number`
         local password=`echo "efefefefefefefefefefefefefefefefefefefefefefefefefefefefefefefef" \
                         | atsha204cmd challenge-response \