BUG/MEDIUM: haload: restore request accounting after user timeouts

BUG/MEDIUM: haload: restore request accounting after user timeouts

The user path drops expired streams without releasing their active-stream
count or their tot_rconns slot, unlike the stream-error path. Once -r is
reached with fewer completions, running_tasks never falls back to zero and
haload hangs until it is killed.

Release both there, matching the error path; the timeout is still counted
as an error. This was introduced with haload in 3.5-dev, no backport needed.