Add core/fallback encoder behaviour (#20320)

keyboards/cannonkeys/balance/balance.c

@@ -15,13 +15,3 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 #include "balance.h"
-
-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 true;
-}