[Ledger] Feature request - BTC addresses

[stephien]

If you connect a Ledger device with Bitcoin addresses (native SegWit Bech32) already used, you can only select the first Address, despite this has already been used and no longer has funds.

• Enable the option to select an Account from the Ledger device that is not only the first one. Currently, only the first address is available for selection when connecting a Ledger device.

• Check for used and empty addresses and show the last one used that has funds or the following one that hasn't been used nor has funds (up to a gap limit). This way the expected address is selected (not empty or not used yet).

Another note: change addresses' funds are not being shown as available in the wallet, Liquality needs to check change addresses until a gap limit to look for change addresses with funds