[BUGFIX] Do not re-set PreviewAspect when initializing TSFE

When the Admin Panel is activated, TSFE should not
override the frontendpreview aspect by default, as
the preview settings will never work otherwise.

Resolves: #92713
Releases: master, 10.4
Change-Id: I070fe49d5196f1ae2e8cc9feed3d16926f5d9728
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66314


Tested-by: Susanne Moog <look@susi.dev>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>