Remove unuseful SafeAreaView (react-navigation#3721)

Author: ma96o

src/views/Drawer/DrawerSidebar.js

@@ -1,6 +1,5 @@
 import React from 'react';
 import { StyleSheet, View } from 'react-native';
-import SafeAreaView from 'react-native-safe-area-view';
 
 import NavigationActions from '../../NavigationActions';
 import invariant from '../../utils/invariant';

src/views/TabView/TabView.js

@@ -1,7 +1,6 @@
 import React from 'react';
 import { View, StyleSheet, Platform } from 'react-native';
 import { TabViewAnimated, TabViewPagerPan } from 'react-native-tab-view';
-import SafeAreaView from 'react-native-safe-area-view';
 
 import ResourceSavingSceneView from '../ResourceSavingSceneView';