[RN] Improve app-settings back button style

react/features/app-settings/components/BackButton.native.js

@@ -4,15 +4,9 @@ import React, { Component } from 'react';
 import { TouchableOpacity } from 'react-native';
 
 import { Icon } from '../../base/font-icons';
-import { Platform } from '../../base/react';
 
 import styles from './styles';
 
-/**
- * The icon glyph to be used on a specific platform.
- */
-const BACK_ICON = Platform.OS === 'android' ? 'arrow_back' : 'navigate_before';
-
 /**
  * The type of the React {@code Component} props of {@link BackButton}
  */
@@ -30,7 +24,7 @@ type Props = {
 };
 
 /**
- * A component rendering a back button that looks native on both platforms.
+ * A component rendering a back button.
  */
 export default class BackButton extends Component<Props> {
     /**
@@ -45,7 +39,7 @@ export default class BackButton extends Component<Props> {
                 accessibilityLabel = { 'Back' }
                 onPress = { this.props.onPress }>
                 <Icon
-                    name = { BACK_ICON }
+                    name = { 'arrow_back' }
                     style = { [
                         styles.backIcon,
                         this.props.style