8307079: Update test java/awt/Choice/DragOffNoSelect.java

Reviewed-by: azvegint, serb

test/jdk/java/awt/Choice/DragOffNoSelectTest.java

@@ -71,7 +71,7 @@ public class DragOffNoSelectTest implements WindowListener, Runnable {
         }
         frame.add(theChoice);
         frame.addWindowListener(testInstance);
-        frame.setSize(400, 400);
+        frame.pack();
         frame.setLocationRelativeTo(null);
 
         frame.setVisible(true);