fix: extraneous btc policy prompt

[meeh0w]

Description

• We would show the BTC policy prompt when user was switching AWAY from the Ledger account, because activeAccount was being updated, but walletDetails.type was still reporting "ledger". We would then go ahead and try to fetch the policy for a non-Ledger account.

Changes

• With this change, we'll wait for activeAccount and walletDetails to be in sync, ensuring it only runs when user switches to Ledger accounts (which don't have the policy registered yet).

Testing

• Onboard with Ledger
• Import seed phrase
• Switch to the Ledger account
• Connect Ledger device & go to the Bitcoin app
• You should be prompted for BTC policy
• Switch to the seed phrase account
• You should not be prompted for BTC policy

Checklist for the author

• I've covered new/modified business logic with Jest test cases.
• I've tested the changes myself before sending it to code review and QA.