runtime guard agc reset if rx duty cycle is enabled

zephcore/app/RepeaterMesh.h

@@ -152,6 +152,9 @@ protected:
         return _prefs.interference_threshold;
     }
     int getAGCResetInterval() const override {
+        if (_prefs.rx_duty_cycle) {
+            return 0;
+        }
         return ((int)_prefs.agc_reset_interval) * 4000;
     }
     uint8_t getExtraAckTransmitCount() const override {