no more warning thanks to iFreilicht's tip with undef

keyboards/satan/keymaps/iso_split_rshift/config.h

@@ -21,6 +21,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "../../config.h"
 
 // only change
+#undef RGB_DI_PIN 
 #define RGB_DI_PIN B2
 
 #endif