BUG/MEDIUM: mux-h2: pass CS_FL_ERR_PENDING to h2_wake_some_streams()

Commiy 8519357c ("BUG/MEDIUM: mux-h2: report asynchronous errors in
h2_wake_some_streams()") addressed an issue with synchronous errors
but forgot to fix the call places to also pass CS_FL_ERR_PENDING
instead of CS_FL_ERROR.

No backport is needed.
diff --git a/src/mux_h2.c b/src/mux_h2.c
index fa7b26f..d61205f 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -1668,7 +1668,7 @@
 
 	last = h2_get_n32(&h2c->dbuf, 0);
 	h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
-	h2_wake_some_streams(h2c, last, CS_FL_ERROR);
+	h2_wake_some_streams(h2c, last, CS_FL_ERR_PENDING);
 	if (h2c->last_sid < 0)
 		h2c->last_sid = last;
 	return 1;