[BUGFIX] Replace non namespaced class call

Resolves: #54865
Releases: 6.2

Change-Id: I43aa7e7fd8511e452cdf6f5c9818e4764abf0309
Reviewed-on: https://review.typo3.org/26716
Reviewed-by: Nico de Haen
Tested-by: Nico de Haen