Remove quantum.h includes from keyboard custom matrix.cs (#23371)

keyboards/om60/matrix.c

@@ -15,7 +15,8 @@ GNU General Public License for more details.
 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 "quantum.h"
+#include "matrix.h"
+#include "wait.h"
 
 #if (MATRIX_COLS <= 8)
 #    define ROW_SHIFTER ((uint8_t)1)