RFR: JDK-8348302 : [Test bug] Update FileDialogIconTest.java [v2]

[Harshitha Onkar]

> FileDialogIconTest.java has been updated.
> 
> Following changes were made.
> 
> -  Test instructions updated
> -  BugID associated with the test is updated to the correct one
> -  setIconBufferedImagesToFrame and setIconBufferedImagesToDialog btns added to the frame.
> -  other minor cleanups

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  spacing

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23523/files
  - new: https://git.openjdk.org/jdk/pull/23523/files/20352059..5d7d497e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23523&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23523&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23523.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23523/head:pull/23523

PR: https://git.openjdk.org/jdk/pull/23523