set window.app in constructor

gui/qt/__init__.py

@@ -223,7 +223,6 @@ class ElectrumGui:
         if url:
             self.set_url(url)
 
-        w.app = self.app
         w.connect_slots(s)
         w.update_wallet()
 

gui/qt/main_window.py

@@ -118,6 +118,7 @@ class ElectrumWindow(QMainWindow):
         self.tray = gui_object.tray
         self.go_lite = gui_object.go_lite
         self.lite = None
+        self.app = gui_object.app
 
         self.create_status_bar()
         self.need_update = threading.Event()