Binance widget no longer disconnects when offline.

[ryanml]

Also by consequence convert timers reset appropriately when dropping network connection.

Fixes: brave/brave-browser#9254
Fixes: brave/brave-browser#9253

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[ryanml]

This will always be empty ({}) in an offline response. Also, we shouldn't set auth to invalid if balances simply just don't come in anyway. The success parameter is the correct thing to go off of for that.

[emerick]

LGTM