Updated the removeScrollbarComponent method

The old method will clean all elements even if user has additional markup that shouldn't be removed. Updated to target only the .overview and .viewport when removed.

example : 

<div class="container">
<div class="somelengthy content"></div>
<div class="dont remove this"></div>
</div>

old method will remove "the dont remove this" when initialized -> destroy

tested under visual composer plugin for wordpress