RFR: 4912623: GTK L&F: Folder list of the JFileChooser is allowing multiple selection unlike native [v2]

[Abhishek Kumar]

On Wed, 14 Dec 2022 11:00:31 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

> Ok with me..Probably better to add a subtest with setMultiSelectionEnabled(false) and check multiple files are not selected..

Added the subtest with `setMultiSelectionEnabled(false)`.

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PR: https://git.openjdk.org/jdk/pull/11627