[BUGFIX] Fix double quotes in ElementBrowser JS

Double quotes must not be used around JS code
created by GeneralUtility::quoteJSvalue()

Resolves: #56406
Releases: 6.2
Change-Id: Ideff0a2ca475dad140a904a770561fa75f4019b9
Reviewed-on: https://review.typo3.org/27924
Reviewed-by: Thomas Sperling
Tested-by: Thomas Sperling
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters