RFR: 8328004: Minor updates to TrayIcon test DisposeInActionEventTest.java [v2]

[Phil Race]

> This was recently converted from a manual Applet to a PassFailJFrame main program
> But I see a few things that could be tweaked
>  - Clarify instructions
>  -  Set path to PassFailJFrame
>  - reduce timeout to default
>  - eliminate redundant folder

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8328004

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18246/files
  - new: https://git.openjdk.org/jdk/pull/18246/files/800c3c43..a94468d6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18246&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18246&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18246.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18246/head:pull/18246

PR: https://git.openjdk.org/jdk/pull/18246