RFR: 8328218: Delete test java/awt/Window/FindOwner/FindOwner.html

[Phil Race]

After some experimentation/thought I think it best to delete this applet test.

It is supposed to be a manual test but is missing the manual keyword so
as far as I can tell it has never been usefully run. Except perhaps a few times
when first being verified.
When I run it in jtreg a window popups up, disappears and the test is passed
Contradicting instructions in the test that tell you it has to be manual because
you need to run it *in the browser* not jtreg.

Well, we don't support browser applets any more.
And the scenario it was testing was explicitly a case that happened with the browser.

And to cap it all, I see no way for you to tell jtreg that it passed or failed - because
you run it in the browser.

So it is manual in the sense that it is NOT a jtreg test and so it should not even have
an @test tag.

These are more than enough reasons to just delete it.

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Commit messages:
 - 8328218

Changes: https://git.openjdk.org/jdk/pull/18314/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18314&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328218
  Stats: 154 lines in 2 files changed: 0 ins; 154 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18314.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18314/head:pull/18314

PR: https://git.openjdk.org/jdk/pull/18314