unable to complete proof request in iOS+Safari with deeplink

[cvarjao]

Steps to reproduce:

• Install BC Walle, Get a lawyer and person credential, and fully terminate the app (optionally)
• open Safari, and go to ACM login page, start the login flow from the same device, and tap on "Continue with BC Wallet")
• BC Wallet app opens, accept the proof request, wait about 20s on the wallet app, and switch to Safari
• vc-authn login page is stuck on "accept proof request in your wallet"

[esune]

@cvarjao, @loneil and myself did some collaborative troubleshooting.

It appears that the issue might be caused by the notification of successful verification being dispatched BEFORE the websocket is re-established after the browser comes out of background mode.

Handling delivery of the payload in the correct order should fix the problem. #636 might be an option to recover too.