Mute RtRefreshManager logs as they break terminal emulation

RtRefreshManager logs random binary strings, which somtimes might be
partial multi-byte Unicode or ASCI escape codes.

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

lib/lotuslog/levels.go

@@ -18,4 +18,6 @@ func SetupLogLevels() {
 		_ = logging.SetLogLevel("stores", "DEBUG")
 		_ = logging.SetLogLevel("nat", "INFO")
 	}
+	// Always mute RtRefreshManager because it breaks terminals
+	_ = logging.SetLogLevel("dht/RtRefreshManager", "FATAL")
 }