[BUGFIX] JS: Init SelectTree after FormEngine

SelectTree depends on availability of TYPO3.FormEngine,
so add FormEngine as Dependency.

Resolves: #82217
Releases: master, 8.7
Change-Id: I2d1a0c8c77b1140f9c501ea105cf8a66a6cd6a97
Reviewed-on: https://review.typo3.org/53815


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>