fixed eslint error & integrated with prettier as well as formatted the whole codebase (#3450)

browser/components/ModalEscButton.js

@@ -3,9 +3,7 @@ import React from 'react'
 import CSSModules from 'browser/lib/CSSModules'
 import styles from './ModalEscButton.styl'
 
-const ModalEscButton = ({
-  handleEscButtonClick
-}) => (
+const ModalEscButton = ({ handleEscButtonClick }) => (
   <button styleName='escButton' onClick={handleEscButtonClick}>
     <div styleName='esc-mark'>×</div>
     <div>esc</div>