[BUGFIX] Wrong check for showing folder clickmenu

This patch fixes a wrong check that prevents the clickmenu
from showing for folders in the filelist.

Resolves: #59568
Releases: 6.3, 6.2
Change-Id: Ic1e8bb28f64717631c4b57bc44221bd1132b876e
Reviewed-on: https://review.typo3.org/30792
Reviewed-by: Markus Klein
Tested-by: Markus Klein