RFR: 8333940: Ensure javax/swing/TestUngrab.java run on all platforms

[Abhishek Kumar]

On Tue, 11 Jun 2024 06:05:02 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> TestUngrab.java was added for [JDK-8267374](https://bugs.openjdk.org/browse/JDK-8267374) macos fix but the test can be run for all platforms as the behaviour is common for all
> CI run job link in JBS..

There are few unused imports in the test.

import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;

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PR Comment: https://git.openjdk.org/jdk/pull/19644#issuecomment-2162142840