fix to add custom stt endpoint to session speech credentials object

lib/utils/db-utils.js

@@ -36,6 +36,8 @@ const speechMapper = (cred) => {
     const o = JSON.parse(decrypt(credential));
     obj.api_key = o.api_key;
     obj.region = o.region;
+    obj.use_custom_stt = o.use_custom_stt;
+    obj.custom_stt_endpoint = o.custom_stt_endpoint;
   }
   else if ('wellsaid' === obj.vendor) {
     const o = JSON.parse(decrypt(credential));