RFR: 8341447: Open source closed frame tests # 5

[Alexander Zvegintsev]

More tests to open source:

- java/awt/Frame/FocusTest.java - in the [problem list](https://bugs.openjdk.org/browse/JDK-8341480) on macos
- java/awt/Frame/InitialIconifiedTest.java - added undecorated case, and improved failure detection for macos

Testing looks good.

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Commit messages:
 - fix path in ProblemList.txt
 - 8341447: Open source closed frame tests # 5

Changes: https://git.openjdk.org/jdk/pull/21372/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21372&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341447
  Stats: 201 lines in 3 files changed: 193 ins; 1 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/21372.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21372/head:pull/21372

PR: https://git.openjdk.org/jdk/pull/21372