RFR: 8327787: Convert javax/swing/border/Test4129681.java applet test to main [v2]

[Tejesh R]

On Tue, 12 Mar 2024 09:00:23 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> Its been used inside `itemListener`.
>
> I guess it was needed but now it's not; so it's better to clean this up.

Yeah, will do it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18189#discussion_r1521152598