BUG/MINOR: mux-h1/mux-fcgi/trace: Fix position of the 4th arg in some traces

In these muxes, when an integer value is provided in a trace, it must be the 4th
argument. The 3rd one, if defined, is always an HTX message. Unfortunately, some
traces are buggy and the 4th argument is erroneously passed in 3rd position.

No backport needed.
2 files changed