Make sms code task use a reference too

- makes the fire text callback behave in consistent way

app/clients/sms/firetext.py

@@ -51,20 +51,16 @@ class FiretextClient(SmsClient):
     def get_name(self):
         return self.name
 
-    def send_sms(self, to, content, notification_id=None):
+    def send_sms(self, to, content, reference):
 
         data = {
             "apiKey": self.api_key,
             "from": self.from_number,
             "to": to.replace('+', ''),
-            "message": content
+            "message": content,
+            "reference": reference
         }
 
-        if notification_id:
-            data.update({
-                "reference": notification_id
-            })
-
         start_time = monotonic()
         try:
             response = request(