[BUGFIX] Fix broken impexp functional tests

Issue #58484 fixed the inclusion of CSS class
attributes in typolinks, but did not adjust the
impexp tests. Update the affected fixture data.

Resolves: #58503
Releases: 6.2
Change-Id: Ib71d50d03d045db37cd411523b54f8c6a1837833
Reviewed-on: https://review.typo3.org/29857
Reviewed-by: Marc Bastian Heinrichs
Tested-by: Marc Bastian Heinrichs