[BUGFIX] Fix path to language file in SelectTreeElement

Fixes missing labels in the svg category tree toolbar.

Releases: master
Resolves: #82934
Change-Id: Iac29bc35b40894630599b3fbec48daf870a8777a
Reviewed-on: https://review.typo3.org/54571


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>