RFR: 8356664: [macos] AppContentTest fails after JDK-8352480

[Alexander Matveev]

- Regression from JDK-8352480.
- On macOS we should create `Links` folder under `Resources`. Which means `--app-content` should point to `app-content/Resources` and not to `app-content/Resources/Links`.

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Commit messages:
 - 8356664: [macos] AppContentTest fails after JDK-8352480

Changes: https://git.openjdk.org/jdk/pull/25164/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25164&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356664
  Stats: 7 lines in 1 file changed: 4 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25164.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25164/head:pull/25164

PR: https://git.openjdk.org/jdk/pull/25164