emulator: applied some clippy lints

src/main.rs

@@ -20,7 +20,11 @@ fn main() -> Result<(), eframe::Error> {
     let processor = Processor::new(Box::new(mainstore));
 
     thread::spawn(move || {
-        run_emulator(cmd_receiver, state_sender, Arc::new(Mutex::new(processor)));
+        run_emulator(
+            &cmd_receiver,
+            &state_sender,
+            &Arc::new(Mutex::new(processor)),
+        );
     });
 
     // Create UI