Make this test more robust by making sure the hex number is bogus.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5700 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/tests/r00387.vtc

@@ -8,7 +8,7 @@ server s1 {
 	send "Transfer-encoding: chunked\r\n"
 	send "\r\n"
 	send "004\r\n1234\r\n"
-	send "000000000000000000001\r\n@\r\n"
+	send "1000000000000000000001\r\n@\r\n"
 	send "00000000\r\n"
 	send "\r\n"
 } -start