[BUGFIX] New Content Element: hide list style

Hides bullet points in New Content Element Wizard.

Resolves: #56062
Releases: 6.2
Change-Id: Iead660b30df3cabea76d22dc962802c61be01ea7
Reviewed-on: https://review.typo3.org/27804
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer