fix: rotary encoder movement should not close throttle warning (#1408)

radio/src/opentx.cpp

@@ -836,7 +836,7 @@ void checkThrottleStick()
   bool refresh = false;
 #endif
 
-  while (!getEvent()) {
+  while (!keyDown()) {
     if (!isThrottleWarningAlertNeeded()) {
       return;
     }