jeffro256 dbc8402da6 wallet: fix wallet_keys_unlocker ...

Fix four issues with wallet_keys_unlocker:
1. It won't decrypt if there are unlockers open simulataneously on multiple `wallet2` instances
2. It won't decrypt if the first unlocker was disabled (i.e. `locked=false`), even with a second non-disabled unlocker
3. If a destructor of an earlier unlocker is triggered before the destructor of a later unlocker, it will re-encrypt too early, while the second unlocker is still in scope
4. Calling the 3-parameter constructor with `locked=true` after an unlocker already exists will "double-encrypt"  the spend key after its destructor since the local variable is `locked=false` and the field member is `locked=true`

Also, replace `wallet2::decrypt_account_for_multisig` with `wallet_keys_unlocker`.

2025-09-04 15:43:38 -05:00

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