Add flexGrow to textField to keep it flexed even when in a row layout

Author: ethanshar

src/incubator/TextField/Input.tsx

@@ -65,6 +65,7 @@ const Input = ({
 
 const styles = StyleSheet.create({
   input: {
+    flexGrow: 1,
     textAlign: Constants.isRTL ? 'right' : 'left',
     // Setting paddingTop/Bottom separately fix height issues on iOS with multiline
     paddingTop: 0,