Allow manual wallet unlocking and prompt/saving of password

Nobody has claimed this yet.

## The Issue
If an incorrect password is provided to account unlock/sync apply, or if the wallet is locked, the app should prompt the user for their password. It should save this value like it does when setting it up initially.

Scenarios:
1) Some users have run into a bug where the wallet is locked and they can't stream/send any funds. They have to uninstall/reinstall.

2) If the wallet sync password changes, the user should be prompted for the new one.

## Anything Else

## Screenshots

## Internal Use

### Acceptance Criteria
1.
2.
3.

### Definition of Done
- [ ] Tested against acceptance criteria
- [ ] Tested against the assumptions of the user story
- [ ] The project builds without errors
- [ ] Unit tests are written and passing
- [ ] Tests on devices/browsers listed in the issue have passed
- [ ] QA performed & issues resolved
- [ ] Refactoring completed
- [ ] Any configuration or build changes documented
- [ ] Documentation updated
- [ ] Peer Code Review performed

Start by tracing the account unlock and sync-apply flows, then inspect how the wallet handles a locked state and how the initial password is saved. Reproduce both an incorrect or changed sync password and a locked wallet. Done means the app prompts for the password, saves the accepted value, and allows the affected wallet actions without reinstalling.

Written by the indexing model from the issue text.