runelite-client: shut down discord service when closed

It is preventing jvm termination otherwise for some reason

runelite-client/src/main/java/net/runelite/client/RuneLite.java

@@ -131,7 +131,7 @@ public class RuneLite
 		}
 
 		// Load swing UI
-		SwingUtilities.invokeAndWait(() -> setGui(ClientUI.create(properties, client)));
+		SwingUtilities.invokeAndWait(() -> setGui(ClientUI.create(this, properties, client)));
 
 		// Initialize Discord service
 		discordService.init();
@@ -182,6 +182,11 @@ public class RuneLite
 		eventBus.post(new ClientUILoaded());
 	}
 
+	public void shutdown()
+	{
+		discordService.close();
+	}
+
 	public void setGui(ClientUI gui)
 	{
 		this.gui = gui;