Update appearance on client arrow.

#story[1095]

racevisionGame/src/main/java/visualiser/model/ResizableRaceCanvas.java

@@ -358,15 +358,15 @@ public class ResizableRaceCanvas extends ResizableCanvas {
 
         //The x coordinates of each vertex of the boat.
         double[] x = {
-                pos.getX() - 12,
+                pos.getX() - 9,
                 pos.getX(),
-                pos.getX() + 12  };
+                pos.getX() + 9  };
 
         //The y coordinates of each vertex of the boat.
         double[] y = {
-                pos.getY() + 24,
+                pos.getY() + 15,
-                pos.getY() - 24,
+                pos.getY() - 15,
-                pos.getY() + 24 };
+                pos.getY() + 15 };
 
         //The above shape is essentially a triangle 24px wide, and 48 long.