fix: add margin on left when left button is specified in header

packages/example/babel.config.js

@@ -1,5 +1,4 @@
 /* eslint-disable import/no-commonjs */
-/* eslint-env node */
 
 module.exports = function(api) {
   api.cache(true);

packages/example/metro.config.js

@@ -1,5 +1,4 @@
 /* eslint-disable import/no-commonjs, import/no-extraneous-dependencies */
-/* eslint-env node */
 
 const path = require('path');
 const fs = require('fs');

packages/example/webpack.config.js

@@ -1,5 +1,4 @@
 /* eslint-disable import/no-commonjs */
-/* eslint-env node */
 
 const createExpoWebpackConfigAsync = require('@expo/webpack-config');