RFR: JDK-8346839 : [TESTBUG] "java/awt/textfield/setechochartest4/setechochartest4.java" failed because the test frame disappears on clicking "Click Several Times" button

[Harshitha Onkar]

Frame.setVisible(false) is removed from the test since the original issue was about adding and removing the textfield and not the frame itself.

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Commit messages:
 - spacing
 - test update

Changes: https://git.openjdk.org/jdk/pull/27301/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27301&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346839
  Stats: 16 lines in 1 file changed: 1 ins; 4 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/27301.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27301/head:pull/27301

PR: https://git.openjdk.org/jdk/pull/27301