fix: Fix inconsistent column offset property

Renamed the composite kscan's column-offset property to col-offset for
consistency with other properties such as matrix transform's col-offset
and matrix kscan's col-gpios.

app/dts/bindings/zmk,kscan-composite.yaml

@@ -26,6 +26,11 @@ child-binding:
     row-offset:
       type: int
       default: 0
+    col-offset:
+      type: int
+      default: 0
+
     column-offset:
       type: int
       default: 0
+      deprecated: true