RFR: 8279879: [TESTBUG] [macos] ActionEvent triggered when right-clicking TrayIcon

[Alisen Chung]

fixed test bug, removed extra ActionEvent from TrayIcon

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Commit messages:
 - 8279879: [TESTBUG] [macos] ActionEvent triggered when right-clicking TrayIcon

Changes: https://git.openjdk.java.net/jdk/pull/7035/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7035&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279879
  Stats: 19 lines in 2 files changed: 1 ins; 15 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7035.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7035/head:pull/7035

PR: https://git.openjdk.java.net/jdk/pull/7035