Adwaita.css: Pathbar active state polished.

Utkarsh Gandhi requested to merge (removed):pathbar_papercut into master

The hover/active state on path bar items currently looks a bit unpolished.

The main issues are: The bounding box of the items touching the dividers. The rounded edges touching the edge of the container.

To fix this issue, we add a margin of 3px around it, and reduce the border-radius to 4px.

#2122 (closed)

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