Remember whether game is muted

src/window.rs

@@ -3,6 +3,7 @@ use std::sync::Arc;
 pub use about::AboutWindow;
 use egui::{Context, ViewportBuilder, ViewportId};
 pub use game::GameWindow;
+pub use game_screen::DisplayMode;
 pub use gdb::GdbServerWindow;
 pub use hotkeys::HotkeysWindow;
 pub use input::InputWindow;