TYPO3 Core

Due to an implementation error in https://review.typo3.org/#/c/Packages/TYPO3.CMS/+/60492/ the depth-dropdown cannot remember the value 0 and always falls back to TYPO3.settings.Workspaces.depth when "This site" is selected.

Reproduce on master:

1. Have workspace changes on at least one subpage of another page
2. go to workspace module
3. click on parent page
4. select "This page" (The selection is updated correctly)
5. click on workspace module again (now the value from UC is loaded)

Expectation: You still see changes on "This site"

Actual behavior: You see changes of subpages, too.