[TASK] Make sysexts composer names standards compliant

Resolves: #53753
Releases: 6.2
Change-Id: I3acb81c71796bc84ada29e6cdf6141be07f69ca3
Reviewed-on: https://review.typo3.org/25503
Reviewed-by: Christian Opitz
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot
Reviewed-by: Felix Kopp
Tested-by: Felix Kopp
Reviewed-by: Thomas Maroschik
Tested-by: Thomas Maroschik