RFR: JDK-8297414: Remove easy warnings in javafx.controls [v6]

[Andy Goryachev]

On Tue, 29 Nov 2022 07:56:48 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> Unsure what you mean by the changes, as I don't know what the default setting (or your settings) are, but I've included the settings as an attachment:

the warnings being addressed by this PR.

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PR: https://git.openjdk.org/jfx/pull/959