[TASK] Streamline PageTreeView node lines with SVG tree

This patch changes the style and the color for node lines
of the `PageTreeView` component to be inline with the line
style of the SVG tree component.

Resolves: #99822
Releases: main
Signed-off-by: Torben Hansen <derhansen@gmail.com>
Change-Id: I9a4030f4d793e4aac2465f5a2c07446e9261023a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77696


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>