REGTESTS: unbreak http-check-send.vtc

As noticed by Christopher, I messed up the version fix in commit
cb4ed02ef ("REGTESTS: mark http-check-send.vtc as 2.4-only"), as while
looking up the commit introducing the change I accidently reverted it.
Let's reinsert the contents of the file prior to that fix, except the
version, of course.
1 file changed