When recordings are enabled, disable bidirectional audio on jambonz-session-record (#415)

lib/session/call-session.js

@@ -1807,6 +1807,7 @@ class CallSession extends Emitter {
           username: JAMBONZ_RECORD_WS_USERNAME,
           password: JAMBONZ_RECORD_WS_PASSWORD
         },
+        disableBiDirectionalAudio: true,
         mixType : 'stereo',
         passDtmf: true
       };