<Swing Dev> RFR: 8143021: [TEST_BUG] Test javax/swing/JColorChooser/Test6541987.java fails

[Prasanta Sadhukhan]

`Please review a test fix for an issue seen to be failing on mach5 systems due to timing issue of keyevents.
Modified test to add setAutoDelay and moved the frame to center of screen.
Mach5 job has been run for several iterations in all platforms. Link in JBS.

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Commit messages:
 - Fixed jcheck issue
 - 8143021: [TEST_BUG] Test javax/swing/JColorChooser/Test6541987.java fails

Changes: https://git.openjdk.java.net/jdk/pull/936/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=936&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8143021
  Stats: 30 lines in 2 files changed: 10 ins; 2 del; 18 mod
  Patch: https://git.openjdk.java.net/jdk/pull/936.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/936/head:pull/936

PR: https://git.openjdk.java.net/jdk/pull/936