<Swing Dev> RFR: 8233637: [TESTBUG] Swing ActionListenerCalledTwiceTest.java fails on macos

[Prasanta Sadhukhan]

Please review a test fix for a test issue seen to be failing on mach5 macos systems due to timing issue.
Modified the test to added delay() after frame is made visible and moved the frame to centre of screen to be consistent with other tests.
Mach5 job has been run for several iterations in all platforms. Link in JBS.

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Commit messages:
 - 8233637: [TESTBUG] Swing ActionListenerCalledTwiceTest.java fails on macos

Changes: https://git.openjdk.java.net/jdk/pull/926/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=926&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233637
  Stats: 6 lines in 2 files changed: 3 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/926.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/926/head:pull/926

PR: https://git.openjdk.java.net/jdk/pull/926