Undid part of commit 428a68cf331b8a70601318ef99b131eb8e07dcd9
Undid part of commit 428a68cf331b8a70601318ef99b131eb8e07dcd9

- Proxy info was already 'making its way' to the Exchange Rate requests
module via the monkey patch in network.py. That part of my commit, while
doing no harm, was reduntant.

- See discussion here: https://github.com/Electron-Cash/Electron-Cash/commit/428a68cf331b8a70601318ef99b131eb8e07dcd9#commitcomment-31746089

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