[Backport 2.2-develop] FIX show visual swatches in admin - product attribute #11747
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Description
Backport of PR: FIX show visual swatches in admin - product attribute #11661
Visual swatch wasn't shown full menu, I only fix some CSS to show full menu. Now the menu is showed correctly.
Fixed Issues (if relevant)
Values of Visual Swatch Attribute drop down is not work correct #11534
Manual testing scenarios
BEFORE:
![screen shot 2017-10-24 at 08 50 41](https://user-images.githubusercontent.com/31536252/31928449-7848e588-b898-11e7-9154-51e2f4592848.png)
NOW:
![screen shot 2017-10-24 at 08 45 55](https://user-images.githubusercontent.com/31536252/31928367-3090724c-b898-11e7-8d3b-91932e3c34d4.png)
Contribution checklist