(Ext) Hardware wallet quirk bug

Setup
- Have SRP1 on a Ledger
- Have SRP2 connected on a Grid+ Lattice
- Connect SRP1 on a Grid+ safe card, and open it on the Lattice
- In MM, open "Connect to hardware wallet"
- MM shows the SRP1 accounts

Problem
- The "continue/connect" button is disabled.
- The "forget this account" button is enabled.

Possible solutions
- Allow forgetting old Ledger accounts
- Allow Adding a hardware wallet account whose account may already be in the wallet, but is being connected by a different hardware wallet.
- Longer term, we should have a multi-hw-backup friendly flow: If a user has connected an address with multiple signers, (or even if not!), during signing users should have a path to "sign with [specific hardware wallet]", so users aren't stuck using an account with the first hardware wallet it is connected with.

Reproduce the Ledger, Grid+ Lattice, and safe card setup, then start from the “Connect to hardware wallet” flow described in the issue. Review the account-selection and connect/forget states; this is done only after the project agrees on whether to forget the old account, add the account through another hardware wallet, or design the longer-term multi-wallet signing flow.

Written by the indexing model from the issue text.