Use HKEY_CURRENT_USER for testing (backport #2513)

[mergify]

Use HKEY_CURRENT_USER for testing as HKEY_LOCAL_MACHINE can't be changed when this test runs under a normal user. Also use const/addressof in various places

Summary by CodeRabbit

• Refactor
  • Updated code initialization patterns and formatting standards in configuration modules for improved consistency and maintainability. These are internal improvements with no impact on user-facing functionality.

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This is an automatic backport of pull request #2513 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5f51784 has failed:

On branch mergify/bp/ace6tao2/pr-2513
Your branch is up to date with 'origin/ace6tao2'.

You are currently cherry-picking commit 5f51784b33.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   ACE/tests/Config_Test.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   ACE/ace/Configuration.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally