fixed errors from lint

browser/main/modals/PreferencesModal/FolderItem.js

@@ -278,7 +278,7 @@ class Handle extends React.Component {
   render () {
     return (
       <div styleName='folderItem-drag-handle'>
-        <i className="fa fa-reorder" />
+        <i className='fa fa-reorder' />
       </div>
     )
   }

browser/main/modals/PreferencesModal/FolderList.js

@@ -7,10 +7,6 @@ import FolderItem from './FolderItem'
 import { SortableContainer, arrayMove } from 'react-sortable-hoc'
 
 class FolderList extends React.Component {
-  constructor (props) {
-    super(props)
-  }
-
   render () {
     let { storage, hostBoundingBox } = this.props
 
@@ -53,7 +49,6 @@ FolderList.propTypes = {
   })
 }
 
-
 class SortableFolderListComponent extends React.Component {
   constructor (props) {
     super(props)
@@ -72,7 +67,6 @@ class SortableFolderListComponent extends React.Component {
   }
 
   render () {
-
     const StyledFolderList = CSSModules(FolderList, this.props.styles)
     const SortableFolderList = SortableContainer(StyledFolderList)