RFR: 8328228: Missing comma in copyright year for a few JColorChooser tests

[Alisen Chung]

Adding comma to copyright years

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Commit messages:
 - init commit

Changes: https://git.openjdk.org/jdk/pull/18317/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18317&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328228
  Stats: 4 lines in 4 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18317.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18317/head:pull/18317

PR: https://git.openjdk.org/jdk/pull/18317