USB-VCP no OFF if internal RF module is set to CRSF (#1957)

* Do not list OFF on VCP menu if internal RF module is set to CRSF to allow pass-through flashing.
Set USB-VCP automatically to CLI when CRSF mode is selected for internal module and it was previously OFF. Activate CLI when iCRSF is selected.

* Companion part

Co-authored-by: elecpower <neilh713@tpg.com.au>

radio/src/storage/storage_common.cpp

@@ -89,7 +89,7 @@ void postRadioSettingsLoad()
 #if defined(USB_SERIAL)
   // default VCP to CLI if not configured
   // to something else as NONE.
-  if (serialGetMode(SP_VCP) == UART_MODE_NONE) {
+  if (isInternalModuleCrossfire() && serialGetMode(SP_VCP) == UART_MODE_NONE) {
     serialSetMode(SP_VCP, UART_MODE_CLI);
   }
 #endif