get_default_image resize image

The function get_default_image, used to read the default image, now
resizes it to the desired size.

src/wdefaults.c

@@ -466,6 +466,10 @@ RImage *get_default_image(WScreen *scr)
 	if (!image)
 		wwarning(_("could not find default icon \"%s\""), path);
 
+	/* Resize the icon to the wPreferences.icon_size size
+	 * usually this function will return early, because size is right */
+	image = wIconValidateIconSize(image, wPreferences.icon_size);
+
 	return image;
 }