[BUGFIX] Fix „templates“ of Extension scanner

Due to a wrong change on the template container, the extension scanner
broke. This change recovers the functionality.

Resolves: #85464
Related: #85455
Releases: master
Change-Id: I3c62e89c59f0424e5381b485f7a11319a303296c
Reviewed-on: https://review.typo3.org/57456


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>