Lite updates on confirm.html

[theclabs]

In the next line there is a var in camelCase, the norm is snake-case. its show a "undefined" error in confirm page.

https://github.com/stellar/sep6-demo-client/blob/e9304206633c2a6fb7ab392e6f212311ad9098f2/src/steps/withdraw/poll_for_success.js#L31

I suggest some small improvements in the UI to show dynamic data. I have the fork with the mods and I plan to add all balances and assets to the main screen.

[msfeldstein]

Yep we should definitely make those dynamic. You can do this by passing query parameters and use the [data-replace] attribute to replace those properties