NewUX: On filename click, select file instead of downloading (#6023)

This commit has been done according to @abperiasamy's feedback as we
are going to reserve the click on file icon to open the preview modal
in the future.

Also, when the user now selects a single file, the file itself is
downloaded instead of a .zip file containing the file.

Fixes #6019

browser/app/js/objects/ObjectItem.js

@@ -15,6 +15,7 @@
  */
 
 import React from "react"
+import classNames from "classnames"
 import { connect } from "react-redux"
 import humanize from "humanize"
 import Moment from "moment"
@@ -34,19 +35,22 @@ export const ObjectItem = ({
   onClick
 }) => {
   return (
-    <div className={"fesl-row"} data-type={getDataType(name, contentType)}>
+    <div 
+      className={
+        "fesl-row " + 
+        classNames({
+          "fesl-row-selected": checked
+        })
+      }
+      data-type={getDataType(name, contentType)}
+    >
       <div className="fesl-item fesl-item-icon">
         <div className="fi-select">
           <input
             type="checkbox"
             name={name}
-            checked={checked}
-            onChange={() => {
-              checked ? uncheckObject(name) : checkObject(name)
-            }}
           />
           <i className="fis-icon" />
-          <i className="fis-helper" />
         </div>
       </div>
       <div className="fesl-item fesl-item-name">
@@ -54,7 +58,7 @@ export const ObjectItem = ({
           href="#"
           onClick={e => {
             e.preventDefault()
-            onClick()
+            checked ? uncheckObject(name) : checkObject(name)
           }}
         >
           {name}