Verify Session triggers verification, but there is no feedback in Mactrix

[scoates]

When clicking "Verify Session", I thought it wasn't working. It was triggering the verification flow in my other Matrix clients, but the lack of feedback in Mactrix made me think it was failing.

I think we should make the button switch to a progress view or at least change text to say something like "Verification requested."

[alicerunsonfedora]

I think I have something that could be suitable for now and have opened a PR for it. After the button is pressed that it goes through successfully, I just have it display a progress view saying "Requesting verification from your trusted devices...".