[BUGFIX] Use same line endings in test as in function

In CommandTest::testGetDescription() now also LF is used as line ending,
just as in the tested function.

Resolves: #85509
Releases: master, 8.7
Change-Id: I907e24b19d87d94a3fb1b3cbee9947d68358e5cc
Reviewed-on: https://review.typo3.org/57501


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>