[CLEANUP] Drop SVN ID markers

As this extension is stored in a GIT repository, the SVN ID markers
are no longer needed.

Change-Id: Iefbbdcb99905db8c765875dc38bcd36588757ffe
Resolves: #58218
Releases: 6.2
Reviewed-on: https://review.typo3.org/29670
Reviewed-by: Nico de Haen
Tested-by: Nico de Haen