RFR: 8348388: Incorrect copyright header in TestFluidAndNonFluid.java

[Theo Weidmann]

Fixes a missing comma in the copyright header.

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Commit messages:
 - Update TestFluidAndNonFluid.java

Changes: https://git.openjdk.org/jdk/pull/23258/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23258&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348388
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23258.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23258/head:pull/23258

PR: https://git.openjdk.org/jdk/pull/23258