Transactions can be signed from the incorrect ledger account

[ryanml]

This is a fix we need to pull in upstream via: MetaMask/eth-ledger-bridge-keyring#14

STR:

1. Connect a Ledger account > 1 (e.g. the 2nd account)
2. Confirm that sending a transaction is signed correctly
3. Reload MetaMask (or, for non-MM, construct a new instance from serialized state)
4. Confirm that sending a transaction is signed with the 1st account on the Ledger (an incorrect account)

Expected:

1. Connect a Ledger account > 1 (e.g. the 2nd account)
2. Confirm that sending a transaction is signed correctly
3. Reload MetaMask (or, for non-MM, construct a new instance from serialized state)
4. Confirm that sending a transaction is signed with the 2nd account on the Ledger (the correct account)

[kjozwiak]

Verification PASSED on macOS 10.15.3 x64 (Catalina) using https://github.com/brave/ethereum-remote-client/releases/tag/0.1.51

Brave | 1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)
-- | --
Revision | fcea73228632975e052eb90fcf6cd1752d3b42b4-refs/branch-heads/3987@{#974}
OS | macOS Version 10.15.3 (Build 19D76)

• Verified the STR outlined via Transactions can be signed from the incorrect ledger account #8530 (comment)
• ensured that connected to a Ledger HW device worked without any issues
• ensured that sending ERC20 tokens from the Ledger into a CW & MM accounts worked
• ensured that receiving ERC20 tokens from CW & MM accounts into the Ledger HW worked

Verification PASSED on Mint 19.1 x64 using https://github.com/brave/ethereum-remote-client/releases/tag/0.1.51

Brave | 1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)
--- | ---
Revision | fcea73228632975e052eb90fcf6cd1752d3b42b4-refs/branch-heads/3987@{#974}
OS | Linux

• Verified the STR outlined via Transactions can be signed from the incorrect ledger account #8530 (comment)
• ensured that connected to a Ledger HW device worked without any issues
• ensured that sending ERC20 tokens from the Ledger into a CW & MM accounts worked
• ensured that receiving ERC20 tokens from CW & MM accounts into the Ledger HW worked

Verification PASSED on Win 10 x64 using https://github.com/brave/ethereum-remote-client/releases/tag/0.1.51

Brave | 1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)
--- | ---
Revision | fcea73228632975e052eb90fcf6cd1752d3b42b4-refs/branch-heads/3987@{#974}
OS | Windows 10 OS Version 1909 (Build 18363.693)

• ensured that connected to a Ledger HW device worked without any issues
• ensured that sending ERC20 tokens from the Ledger into a CW & MM accounts worked
• ensured that receiving ERC20 tokens from CW & MM accounts into the Ledger HW worked

Couldn't go through the above cases on Win x64 due to running into #7687. Unfortunately the work around specified under https://support.ledger.com/hc/en-us/articles/360023190873-Fix-for-Windows-10-security-popup.