BUG/MINOR: mux-h1: Fix size evaluation of HTX messages after headers parsing

The block size of the start-line was not counted.

This patch must be backported to 2.0.

(cherry picked from commit 8427d0d6f8b17615be4cb2a80a8af794ae9c55d2)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed