Fix histogram displaying wrong interval for jitter

packet-exchange/src/server.c

@@ -301,8 +301,8 @@ static void print_histograms() {
              "\"metadata\": {"
                 "\"i\": \"%dus\", \"duration\": \"%dh%d\""
                 "},"
-             "\"props\": [[", interval,
-                              MAX_HIST_VAL / 2 - min_hist_val,
+             "\"props\": [[", MAX_HIST_VAL / 2 - min_hist_val,
+                              interval,
                               duration_hour,
                               duration_minutes);