Fix cannon plugin showing incorrect double hit spots after region change

Fixes #820

runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonOverlay.java

@@ -100,7 +100,7 @@ class CannonOverlay extends Overlay
 		if (config.showDoubleHitSpot())
 		{
 			Color color = config.highlightDoubleHitColor();
-			drawDoubleHitSpots(graphics, plugin.getCannon().getLocalLocation(), color);
+			drawDoubleHitSpots(graphics, cannonPoint, color);
 		}
 
 		return null;