RTT fixes (#7428)

* Few code updates

* Do not show average RTT before timing out

* Fix unwanted integer division in RTTStatistics

* Fix float format, prettier jitter calculation

* Use +=, 0.1f -> 100.0f for stronger average updates

src/network/peerhandler.h

@@ -30,7 +30,8 @@ typedef enum {
 	AVG_RTT,
 	MIN_JITTER,
 	MAX_JITTER,
-	AVG_JITTER
+	AVG_JITTER,
+	TIMEOUT_COUNTER
 } rtt_stat_type;
 
 class Peer;