Replaced fa-times for close button on download bar with SVG button (r…

…edo #6071)

Closes #6070

Fixes 2c55150
The close button implemented fa-times on the download bar has been replaced with the SVG button with the PR: #6071

Auditors: @bridiver @bbondy

Test Plan:
1. Download a file
2. Make sure the download button is replaced with the SVG button on #6071
3. Make sure automated test passes

app/renderer/components/downloadsBar.js

@@ -39,8 +39,7 @@ class DownloadsBar extends ImmutableComponent {
         }
       </div>
       <div className='downloadBarButtons'>
-        <Button iconClass='fa-times'
-          className='hideDownloadsToolbar downloadButton smallButton hideButton'
+        <Button className='downloadButton hideDownloadsToolbar'
           onClick={this.onHideDownloadsToolbar} />
       </div>
     </div>