Running state properly reset on power-on

src/state.rs

@@ -95,6 +95,7 @@ impl EmuState {
             FrontpanelInteraction::Power(pwr) => {
                 if pwr {
                     self.audio_tx.send(AudioMessage::FanOn).unwrap();
+                    self.running = false;
                     self.cpu = I8080::new();
                     self.update_fp();
                 } else {