RFR: 8286620: Create regression test for verifying setMargin() of JRadioButton [v3]

[Tejesh R]

On Wed, 1 Jun 2022 04:45:12 GMT, Tejesh R <duke at openjdk.java.net> wrote:

> > I wonder why the test is Windows-specific if it allows changing Look and Feels.
> > The only Look and Feel which ignores the background is Nimbus, other L&Fs on Windows at least paint the yellow and green background. As such, the test can be run on other platforms.
> > Was the original bug in Windows Look and Feel? If so, you may want to make it the default L&F.
> > The instructions don't mention anything about other Look and Feels. Does the tester have to verify each presented L&F?
> 
> I think the test was in windows which I might have retained the os type, will check and confirm once. The tester have to verify with each L&F for left margin check.

Yeah, it was only for Motif and Windows before, so I have retained it for only windows os.

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PR: https://git.openjdk.java.net/jdk/pull/8721