Freeciv

Qt races_dialog private slots (nation_selected, style_selected, and group_selected) parameters have several issues:
- The 'deselected' parameter is unused, so can be dropped (it's also typoed, but that doesn't matter when it's dropped completely)
- Parameters have different names in .h and .cpp. Should be the clear one ("selected" instead of "sl" in both
- Indentation of style_selected() is off