add new ENABLE_WIFI_INTERFACE build flag for companions without providing ssid and pwd

examples/companion_radio/ui-tiny/UITask.cpp

@@ -4,7 +4,7 @@
 #include "target.h"
 #include "u8g2_icons.h"
 
-#ifdef WIFI_SSID
+#ifdef ENABLE_WIFI_INTERFACE
   #include <WiFi.h>
 #endif
 
@@ -173,7 +173,7 @@ public:
       display.setCursor(0, 19);
       display.print(tmp);
 
-      #ifdef WIFI_SSID
+      #ifdef ENABLE_WIFI_INTERFACE
         IPAddress ip = WiFi.localIP();
         snprintf(tmp, sizeof(tmp), "IP: %d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
         display.setTextSize(1);