correct receiver LBT TXdoneCallback (ExpressLRS#2768)

* correct receiver LBT TXdoneCallback

* revert diversity rx ChannelIsClear improvment

src/src/rx_main.cpp

@@ -511,6 +511,15 @@ bool ICACHE_RAM_ATTR HandleSendTelemetryResponse()
 
 #if defined(Regulatory_Domain_EU_CE_2400)
     transmittingRadio &= ChannelIsClear(transmittingRadio);   // weed out the radio(s) if channel in use
+
+    if (transmittingRadio == SX12XX_Radio_NONE)
+    {
+        // No packet will be sent due to LBT.
+        // Defer TXdoneCallback() to prepare for TLM when the IRQ is normally triggered.
+        deferExecutionMicros(ExpressLRS_currAirRate_RFperfParams->TOA, []() {
+            Radio.TXdoneCallback();
+        });
+    }
 #endif
 
     if (config.GetForceTlmOff())
@@ -730,14 +739,6 @@ static void ICACHE_RAM_ATTR updateDiversity()
 
 void ICACHE_RAM_ATTR HWtimerCallbackTock()
 {
-    if (tlmSent && Radio.GetLastTransmitRadio() == SX12XX_Radio_NONE)
-    {
-        // Since we were meant to send telemetry, but didn't, defer TXdoneCallback() to when the IRQ is normally triggered.
-        deferExecutionMicros(ExpressLRS_currAirRate_RFperfParams->TOA, []() {
-            Radio.TXdoneCallback();
-        });
-    }
-
     PFDloop.intEvent(micros()); // our internal osc just fired
 
     if (ExpressLRS_currAirRate_Modparams->numOfSends > 1 && !(OtaNonce % ExpressLRS_currAirRate_Modparams->numOfSends))