BUG/MINOR: mux_h2: missing space between "st" and ".flg" in the "show fd" helper

That was causing confusing outputs like this one whenan H2S is known:

   1030 : ... last_h2s=0x2ed8390 .id=775 .st=HCR.flg=0x4001 .rxbuf=...
                                                ^^^^

This was introduced by commit ab2ec4540 in 2.1-dev2 so the fix can be
backported as far as 2.1.

(cherry picked from commit ed4464e6c698bfb410610b7f3850cd0fa3331eb1)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 12da9af..0084d5f 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -6223,7 +6223,7 @@
 		      (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
 
 	if (h2s) {
-		chunk_appendf(msg, " last_h2s=%p .id=%d .st=%s.flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
+		chunk_appendf(msg, " last_h2s=%p .id=%d .st=%s .flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
 			      h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
 			      (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
 			      (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),