Fix state previews not showing when a rom is loaded (and fix them cra…

…shing when a rom is not loaded)

GSE/StateManager.cs

@@ -61,7 +61,7 @@ private void LoadStatePreview()
 	private void OnStateSlotChanged()
 	{
 		osdManager.QueueMessage($"Current state slot set to {GetStateSlot(config.SaveStateSlot)}");
-		if (!config.HideStatePreviews && !emuManager.RomIsLoaded)
+		if (!config.HideStatePreviews && emuManager.RomIsLoaded)
 		{
 			LoadStatePreview();
 		}