Change text to show alert termplate msg (#13521)

In the initial pull request this was brought up but never addressed, https://github.com/librenms/librenms/pull/9305#issuecomment-427930650  The only reason i can think of is due to SMS message length, but you could be mindful of that with a alert template.  Submitting this to see if anyone objects to changing it.

LibreNMS/Alert/Transport/Twilio.php

@@ -36,7 +36,7 @@ class Twilio extends Transport
             'sid' => $opts['sid'],
             'token' => $opts['token'],
             'phone' => $opts['to'],
-            'text' => $obj['title'],
+            'text' => $obj['msg'],
             'sender' => $opts['sender'],
         ];