[e.cash] Modify ViaWallet
Summary: ViaWallet is now CoinEx Wallet, editing the wallet data to reflect this
Test Plan: preview the site, go to /wallets and check CoinEx wallet looks good/link works
Reviewers: #bitcoin_abc, bytesofman
Reviewed By: #bitcoin_abc, bytesofman
Subscribers: bytesofman
Differential Revision: https://reviews.bitcoinabc.org/D16441