file upload doesnt work in IE after the first upload event or clear event

[manichandra]

I'm submitting a

[x] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

**Plunkr Case (Bug Reports)**
you can see 

https://www.primefaces.org/primeng/#/fileupload

**Current behavior**
<!-- In IE, after uploading the first file or clicking on the "clear" button after choosing file/files , when we click on chose and select file/files, they don't show up in the content area. That means file upload works only first time in IE.  -->

**Minimal reproduction of the problem with instructions**
<!--
click on "choose" and select file/files
you will see selected files in the content area
click on "cancel" button. 
click again on "choose' and select files
they don't show up 
-->

**What is the motivation / use case for changing the behavior?**
<!-- File upload in IE -->

**Please tell us about your environment:**
<!-- Windows 7, Webstorm  IDE, npm, primeNg 4.1 -->

* **Angular version:** 4.1
<!-- Check whether this is still an issue in the most recent Angular version -->

* **PrimeNG version:** 4.1
<!-- still an issue in the latest version-->

* **Browser:** IE 11