Fix flaky graphics-draw-arc test by correcting arc dimensions

The original test code incorrectly used absolute coordinates (right/bottom edges) as width/height arguments for `drawArc`, causing massive arcs to be drawn outside the component bounds. This likely led to rendering artifacts and flakiness on Android. This change updates the logic to draw concentric arcs that stay within the component bounds.

Author: google-labs-jules[bot]

scripts/hellocodenameone/common/src/main/java/com/codenameone/examples/hellocodenameone/tests/graphics/DrawArc.java

@@ -10,7 +10,7 @@ protected void drawContent(Graphics g, Rectangle bounds) {
         g.setColor(0xffffff);
         for (int iter = 0 ; iter < bounds.getWidth() / 2 ; iter++) {
             nextColor(g);
-            g.drawArc(bounds.getX() + iter, bounds.getY() + iter, bounds.getX() + bounds.getWidth() - iter, bounds.getY() + bounds.getHeight() + iter, iter, 180);
+            g.drawArc(bounds.getX() + iter, bounds.getY() + iter, bounds.getWidth() - iter * 2, bounds.getHeight() - iter * 2, iter, 180);
         }
     }