RFR: 8205137: Remove Applet support from SwingSet2 [v2]

[Alisen Chung]

On Fri, 10 Sep 2021 21:58:29 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> In all the files except for `ButtonDemo.java`, you modify the imports only; in case of `ButtonDemo.java`, you also reformat the code. Is it intentional?

Oh the reformat was unintentional, let me revert that...

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PR: https://git.openjdk.java.net/jdk/pull/5401