Fix exp tracker UI margin incosistency

This reduces the top margin of the exp tracker UI to match the other sides and the similarly designed Loot Tracker.

runelite-client/src/main/java/net/runelite/client/plugins/xptracker/XpPanel.java

@@ -67,7 +67,7 @@ class XpPanel extends PluginPanel
 	{
 		super();
 
-		setBorder(new EmptyBorder(10, 6, 10, 6));
+		setBorder(new EmptyBorder(6, 6, 6, 6));
 		setBackground(ColorScheme.DARK_GRAY_COLOR);
 		setLayout(new BorderLayout());