[Bug]: Chat mute options are saved to prefs file

### Describe the Bug

The chat options store muted players by army index, which is a value unrelated to the actual player. These options are then saved into the preference file, which persists between games, so there is a bug that unrelated players are muted between games due to sharing an army index.

### Reproduce the bug

Mute a player in chat config, exit the application, then start a new game and that player should be muted by default since that's the value in the preference file.

### Screenshots

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### Additional context

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