[jfx-tests] RFR: 8315809: Fix copyright lines in jfx-tests repo after JDK-8315409

[Kevin Rushforth]

As mentioned in the JBS Description, I generated this PR by running the same copyright tool we use to update the jfx repo, with a slight modification to not filter out those files that already had "Copyright.*2023", since those are the ones that need to be fixed up for incorrect formatting.

I manually reverted two files that had an embedded copyright line in a String.

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Commit messages:
 - 8315809: Fix copyright lines in jfx-tests repo after JDK-8315409

Changes: https://git.openjdk.org/jfx-tests/pull/2/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx-tests&pr=2&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315809
  Stats: 139 lines in 139 files changed: 0 ins; 0 del; 139 mod
  Patch: https://git.openjdk.org/jfx-tests/pull/2.diff
  Fetch: git fetch https://git.openjdk.org/jfx-tests.git pull/2/head:pull/2

PR: https://git.openjdk.org/jfx-tests/pull/2