[BUGFIX] Fix broken path to fonts in t3skin

Follow-up: #51134
Releases: 6.2
Change-Id: I80c2f2bab106cf78a93e371e613c8049510f7bfd
Reviewed-on: https://review.typo3.org/23306
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny