[BUGFIX] Info->Pagetree overview - Drop "red plus" icon

The "red plus" "has sub pages" indicator in Info->pagetree Overview
brings no sane and usable benefit and is dropped.

Resolves: #81872
Releases: master, 8.7
Change-Id: Ifb68d47ae48b0db1a68001644062fd7dd6d7126a
Reviewed-on: https://review.typo3.org/53494


Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>