Revert "Position: Use absolute positioning when getting scrollbar width to avoid reflows of user content. Fixes #9291 - Position - $.position.scrollbarWidth detection causes layout issues."

This reverts commit 1d3b8ff78eaa3d64a839ba34af34d1e8b24f82af.
Position: Use absolute positioning when getting scrollbar width to avoid reflows of user content. Fixes #9291 - Position - $.position.scrollbarWidth detection causes layout issues.