Network: Draw reach as black color when is current reach.

src/View/Network/GraphWidget.py

@@ -158,7 +158,7 @@ class EdgeItem(QGraphicsItem):
         if self.graph.selected_item() == self:
             color = Qt.red
         elif self.graph.current_edge() == self:
-            color = Qt.blue
+            color = Qt.black
         elif not self.graph.graph.is_enable_edge(self.edge):
             color = Qt.darkGray