Fix infinite recursivity when changing node state

src/cutecoin/core/net/node.py

@@ -252,8 +252,8 @@ class Node(QObject):
                                                                         self.state, new_state))
         if self._state != new_state:
             self.last_change = time.time()
-            self.changed.emit()
             self._state = new_state
+            self.changed.emit()
 
     @property
     def fork_window(self):