RFR: JDK-8254748: Bad Copyright header format after JDK-8212218

[Thomas Stuefe]

Please review this trivial copyright header fix. Thank you.

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Commit messages:
 - JDK-8254748

Changes: https://git.openjdk.java.net/jdk/pull/652/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=652&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254748
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/652.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/652/head:pull/652

PR: https://git.openjdk.java.net/jdk/pull/652