[FOLLOWUP][BUGFIX] dont set fePreview=2 with ADMCMD_noBeUser

Restructure the nested condition for the sake of readability.

Releases: master, 6.2
Resolves: #67224
Change-Id: I25161348509245dee56b61f3a1f15d9bc778500b
Reviewed-on: http://review.typo3.org/39863


Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>