RFR: 8344578: Clean up left over java.security and sun.security imports in Swing classes

[Prasanta Sadhukhan]

On Tue, 19 Nov 2024 22:03:18 GMT, Phil Race <prr at openjdk.org> wrote:

> This cleans up some left over un-used imports and one variable that was left behind.

Marked as reviewed by psadhukhan (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/22260#pullrequestreview-2447449365