fix(styles): Fix component displayNames when using createStyledComponent  
fix(styles): Fix component displayNames when using createStyledComponent  

* Stop setting displayName on element passed to createStyledComponent.  DisplayName is a static property and this was incorrectly overwriting values when the element was a component. This should have been set on the returned component rather than the element. As the call to Emotion/styled already does this for us, we actually don’t need to do anything at all.
mineral-ui/mineral-ui,mineral-ui/mineral-ui