MINOR: mux-quic: adjust traces on stream init

Adjust traces on qcc_init_stream_remote() : replace "opening" by
"initializing" to avoid confusion with traces dealing with OPEN stream
state.
diff --git a/src/mux_quic.c b/src/mux_quic.c
index 7b71ddb..2b53c0d 100644
--- a/src/mux_quic.c
+++ b/src/mux_quic.c
@@ -615,8 +615,8 @@
 	BUG_ON(id < *largest);
 
 	while (id >= *largest) {
-		const char *str = *largest < id ? "opening intermediary stream" :
-		                                  "opening remote stream";
+		const char *str = *largest < id ? "initializing intermediary remote stream" :
+		                                  "initializing remote stream";
 
 		qcs = qcs_new(qcc, *largest, type);
 		if (!qcs) {