fix(vpaas) send jitsiMeetId instead of billingId

react/features/billing-counter/constants.js

@@ -1,7 +1,7 @@
 /**
  * The key for the billing id stored in localStorage.
  */
-export const BILLING_ID = 'billingId';
+export const BILLING_ID = 'jitsiMeetId';
 
 /**
  * The prefix for the vpaas tenant.