fix: Flashing internal ISRM and via S.PORT connector (#3374)

* fix: re-enabled flashing via S.PORT connector

* fix: remove check for productId on internal module

radio/src/io/frsky_firmware_update.cpp

@@ -315,8 +315,7 @@ const char *FrskyDeviceFirmwareUpdate::doFlashFirmware(
       return STR_DEVICE_FILE_WRONG_SIG;
     }
 
-    if (information.productFamily == FIRMWARE_FAMILY_INTERNAL_MODULE &&
-        information.productId == FIRMWARE_ID_MODULE_ISRM) {
+    if (information.productFamily == FIRMWARE_FAMILY_INTERNAL_MODULE) {
       port = ETX_MOD_PORT_UART;
     }