RFR: 8328818: Fix Decora JSL to remove missing @Override warnings

[Andy Goryachev]

Updating the JSL files to remove the "missing @ override" warning.

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Commit messages:
 - 8328818: Fix Decora JSL to remove missing @Override warnings

Changes: https://git.openjdk.org/jfx/pull/1425/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1425&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328818
  Stats: 4 lines in 2 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1425.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1425/head:pull/1425

PR: https://git.openjdk.org/jfx/pull/1425