Removed the Nemo text-shadow effect in the sidebar.
Theme fix for selected item in sidebar coloring.

The selected item is not reliably set in the Nemo sidebar, leading to a
flicker. By forcing the selected color to be the same as the unselected
foreground color, we fix this.
Merge pull request #22 from wrouesnel/nemo-sidebar-improvement

Nemo sidebar text drop-shadow removal