RFR: 8320349: Simplify FileChooserSymLinkTest.java by using single-window testUI

[Sergey Bylokhov]

On Fri, 17 Nov 2023 20:21:32 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> Update `FileChooserSymLinkTest.java` to simplify its implementation by replacing `List<Window>` with `JFrame` of its `createTestUI` which now uses `PassFailJFrame.Builder testUI(PassFailJFrame.WindowCreator)` instead of `PassFailJFrame.Builder testUI(PassFailJFrame.WindowListCreator)`.
> 
> The test works correctly with and without the update.
> 
> This PR depends on #16717.

Marked as reviewed by serb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16718#pullrequestreview-1758334333