Fixing headers for gateway modules (#1554)

* Fixing red squiggles in VSCode/PlatformIO

* Lint issues

main/config_RF.h

@@ -66,6 +66,9 @@ extern void disableRTLreceive();
 extern int getRTLrssiThreshold();
 extern int getRTLCurrentRSSI();
 extern int getRTLMessageCount();
+extern int getRTLAverageRSSI();
+extern int getOOKThresh();
+
 #  ifdef ZmqttDiscovery
 extern void launchRTL_433Discovery(bool overrideDiscovery);
 // This structure stores the entities of the RTL 433 devices and is they have been discovered or not