Add core/fallback encoder behaviour (#20320)

keyboards/drop/sense75/sense75.c

@@ -133,16 +133,3 @@ const is31_led PROGMEM g_is31_leds[RGB_MATRIX_LED_COUNT] = {
     { 1, H_16, G_16, I_16 }
 };
 #endif
-
-#ifdef ENCODER_ENABLE
-bool encoder_update_kb(uint8_t index, bool clockwise) {
-    if (!encoder_update_user(index, clockwise)) return false;
-
-    if (clockwise) {
-        tap_code(KC_VOLU);
-    } else {
-        tap_code(KC_VOLD);
-    }
-    return false; 
-}
-#endif