Migrate SPLIT_HAND_PIN to json (#23924)

keyboards/salicylic_acid3/ergoarrows/config.h

@@ -17,8 +17,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#define SPLIT_HAND_PIN B6
-
 #ifndef IOS_DEVICE_ENABLE
   #define RGBLIGHT_LIMIT_VAL 90
   #define RGBLIGHT_VAL_STEP 17

keyboards/salicylic_acid3/ergoarrows/keyboard.json

@@ -30,6 +30,9 @@
     "diode_direction": "COL2ROW",
     "split": {
         "enabled": true,
+        "handedness": {
+            "pin": "B6"
+        },
         "soft_serial_pin": "D0"
     },
     "rgblight": {