Enhancement: Remember my choice of blockchain for BTC and BCH separately

[tpansino]

It is a HUGE pain right now to manage both Bitcoin and BitcoinCash with the Nano S + Chrome wallet. Currently, switching from BTC to BCH (or vice versa) requires:

• Opening the correct app on the Nano S device
• Selecting the desired block chain
• Selecting Legacy vs. Segwit (for BTC) or Main vs. Split (for BCH)

This is a ton of steps for something as simple as checking a wallet balance, mostly because the "Remember my choice" option only applies to which blockchain should be selected, but it affects both BTC and BCH, which doesn't make sense.

Proposal for what should be enhanced:

• Opening the BitcoinCash app on the Nano S should automatically select the BitcoinCash blockchain, as it is the only valid chain currently in existence for BCH (please correct me if I am wrong about this).
• Selecting Legacy vs. Segwit and Main vs. Split should have a "Remember my choice" option, just as the selection screen for the Bitcoin blockchain does. (This could also be implemented as simply no longer prompting once the user selects Segwit or Split, as I believe once those are selected it doesn't make sense to go back to the other option. Again please correct me if I am wrong here.)

Thanks.

[tpansino]

Any update? I see this was referenced in #47, but I don't see how the code pulled there fixes this issue.