Fix Missing Chart.js File (#1738)

This PR will fix missing Chart.js on Index2.html. This missing file causes by typo which is written Chart.js where it should be chart.js

index2.html

@@ -1562,7 +1562,7 @@ <h3 class="control-sidebar-heading">Chat Settings</h3>
 <!-- SlimScroll -->
 <script src="bower_components/jquery-slimscroll/jquery.slimscroll.min.js"></script>
 <!-- ChartJS -->
-<script src="bower_components/Chart.js/Chart.js"></script>
+<script src="bower_components/chart.js/Chart.js"></script>
 <!-- AdminLTE dashboard demo (This is only for demo purposes) -->
 <script src="dist/js/pages/dashboard2.js"></script>
 <!-- AdminLTE for demo purposes -->