[BUGFIX] Fix line endings in generated .htaccess file

Now uses LF instead of CRLF.

Change-Id: I1fcb0c05f077f456f90583344ce4c2298ce747e5
Resolves: #58279
Releases: 6.2
Reviewed-on: https://review.typo3.org/29698
Reviewed-by: Nico de Haen
Tested-by: Nico de Haen