update calculator,

03_source/mobile/src/pages/DemoReactCalculator/components/ButtonRow.tsx

@@ -0,0 +1,9 @@
+import { IonRow } from '@ionic/react';
+import styles from './ButtonRow.module.scss';
+import React from 'react';
+
+const ButtonRow = (props): React.JSX.Element => {
+  return <IonRow className={styles.buttonRow}>{props.children}</IonRow>;
+};
+
+export default ButtonRow;