[BUGFIX] Typoscript ">" operator removes too much

page = PAGE
page {
  10 = COA
  10 {
    10 = TEXT
    10.value = A
    20 = TEXT
    20.value = B
    30 = TEXT
    30.value = C
  }
}
page.10.30 >

This correctly unsets 'page.10.30', but also
'page.10.10' which should be kept of course.

The patch fixes this by avoiding a bogus
removeChildByName().

Resolves: #102831
Related: #97816
Releases: main, 12.4
Change-Id: Iab66e9c3187588cb403f7c4e65145863314817d3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82559


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>