[BUGFIX] Fix JS error in ElementBrowser

Fix for #41413 did not remove a superfluous parentheses.
This is causing a JS error now.

Backports of the original patch are fixed already.

Resolves: #56289
Releases: 6.2
Change-Id: Iff0e73a28c9428d931f44b538106b6120ccc4e6a
Reviewed-on: https://review.typo3.org/27854
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters