Exclude element screenshot tests from IE11

[ZheSun88]

Thanks for submitting a pull request!
Please confirm that your pull request follows our guidelines found in CONTRIBUTING and that you provide enough information so that we can review your pull request.

<Description of pull request, e.g. "Fix Grid Column not sortable with backend data and sort property">

Fixes #

Check when you have completed
[ ] Valid tests for the pull request
[ ] Contributing guidelines implemented

---

This change is 

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}