<Swing Dev> Integrated: 8254141: Typo in copyright year

[Prasanta Sadhukhan]

Fix typo in copyright

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Commit messages:
 - 8254141: Typo in copyright year

Changes: https://git.openjdk.java.net/jdk/pull/536/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=536&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254141
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/536.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/536/head:pull/536

PR: https://git.openjdk.java.net/jdk/pull/536