Fix crash in ClienUI configChanged event

Fix crash that can happen when ConfigChanged event arrives to ClientUI
and pack method is called in the event thread. Move swing/awt related
calls to swing thread to avoid this issue.

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

runelite-client/src/main/java/net/runelite/client/ui/ClientUI.java

@@ -269,6 +269,8 @@ public class ClientUI extends JFrame
 
 		Dimension size = new Dimension(width, height);
 
+		SwingUtilities.invokeLater(() ->
+		{
 			client.setSize(size);
 			client.setPreferredSize(size);
 
@@ -279,6 +281,7 @@ public class ClientUI extends JFrame
 			{
 				pack();
 			}
+		});
 	}
 
 	private static void setUIFont(FontUIResource f)