fix(FEC-8922): ima preset with useStyledLinearAds=true cuts the control bar in half

[odedhutzler]

adding an element with the style of the bottom bar, only for background look and feel. All the clicks will go through it.

Description of the Changes

Please add a detailed description of the change, whether it's an enhancement or a bugfix. If the PR is related to an open issue please link to it.

CheckLists

• [ ] changes have been done against master branch, and PR does not conflict
• [ ] new unit / functional tests have been added (whenever applicable)
• [ ] test are passing in local environment
• [ ] Travis tests are passing (or test results are not worse than on master branch :))
• [ ] Docs have been updated

---

This change is 

[kaltura-hooks]

Hi @odedhutzler, Thank you for contributing this pull request! Please sign the Kaltura CLA so we can review and merge your contribution. Learn more at http://bit.ly/KalturaContrib