Pause RGSS execution when moving into background on Android

Assuming that there is enough memory for mkxp to stay in the
background and that the OS doesn't kill the process, this should
allow smooth resuming after moving back into the foreground.

For now, EGL context loss is not handled.

src/sharedstate.cpp

@@ -108,7 +108,7 @@ struct SharedStatePrivate
 	      midiState(threadData->config),
 	      graphics(threadData),
 	      input(*threadData),
-	      audio(threadData->config),
+	      audio(*threadData),
 	      fontState(threadData->config),
 	      stampCounter(0)
 	{