Prevent sending telemetry when baud negotiation in progress

src/main/telemetry/crsf.c

@@ -744,6 +744,13 @@ void handleCrsfTelemetry(timeUs_t currentTimeUs)
     if (!crsfTelemetryEnabled) {
         return;
     }
+
+#if defined(USE_CRSF_V3)
+    if (crsfBaudNegotiationInProgress()) {
+        return;
+    }
+#endif
+
     // Give the receiver a chance to send any outstanding telemetry data.
     // This needs to be done at high frequency, to enable the RX to send the telemetry frame
     // in between the RX frames.