[BUGFIX] Avoid invalid setup in Typo3StatusTest

Let getLL() return string in tests to avoid a
"sprintf(): Passing null to parameter #1" from
Typo3Status test. Sanitize that sprintf().

Resolves: #95749
Releases: master
Change-Id: I851badd4e8f6bcdd64ba2e70d37dafcce03e905b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71952


Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Simon Gilli <typo3@gilbertsoft.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>