Media: remove the alias name Song to avoid confusion

So we don't have code like `#define FF_SONG_MODULE_NAME "Media"`.
Also fix the error `unknown option: --media-format`

src/flashfetch.c

@@ -48,7 +48,7 @@ int main(int argc, char** argv)
     ffPrintBattery(&instance);
     ffPrintPowerAdapter(&instance);
     //ffPrintPlayer(&instance);
-    //ffPrintSong(&instance);
+    //ffPrintMedia(&instance);
     //ffPrintLocalIp(&instance);
     //ffPrintPublicIp(&instance);
     //ffPrintWifi(&instance);