Network: Add missing () on method to check if study is editable

src/View/Network/Window.py

@@ -147,7 +147,7 @@ class NetworkWindow(PamhyrWindow):
         self._graph_widget.changeEdge.connect(self.update)
         self._graph_widget.changeNode.connect(self.update)
 
-        if self._study.is_editable:
+        if self._study.is_editable():
             self._nodes_model\
                 .dataChanged\
                 .connect(self._graph_widget.rename_nodes)