Audio: Properly close audio device on emulator destruction (#637)

* Audio: Properly close audio device on emulator destruction

* Undo oopsie

include/audio/miniaudio_device.hpp

@@ -21,10 +21,12 @@ class MiniAudioDevice {
 	bool running = false;
 
 	std::vector<std::string> audioDevices;
+
   public:
 	MiniAudioDevice();
 	// If safe is on, we create a null audio device
 	void init(Samples& samples, bool safe = false);
+	void close();
 
 	void start();
 	void stop();