kivy: fix OutputItem initialisation

gui/kivy/main.kv

@@ -90,7 +90,7 @@
         id: lbl2
         text: root.value
 
-<OutputItem@BoxLayout>
+<OutputItem>
     address: ''
     value: ''
     size_hint_y: None

gui/kivy/main_window.py

@@ -32,6 +32,7 @@ Factory.register('InstallWizard',
                  module='electrum_gui.kivy.uix.dialogs.installwizard')
 Factory.register('InfoBubble', module='electrum_gui.kivy.uix.dialogs')
 Factory.register('OutputList', module='electrum_gui.kivy.uix.dialogs')
+Factory.register('OutputItem', module='electrum_gui.kivy.uix.dialogs')
 
 
 

gui/kivy/uix/dialogs/__init__.py

@@ -192,6 +192,9 @@ class InfoBubble(Factory.Bubble):
 
 
 
+class OutputItem(Factory.BoxLayout):
+    pass
+
 class OutputList(Factory.GridLayout):
 
     def __init__(self, **kwargs):
@@ -204,8 +207,8 @@ class OutputList(Factory.GridLayout):
             self.add_output(address, amount)
 
     def add_output(self, address, amount):
-        b = Factory.OutputItem(
-            address = address,
-            value = self.app.format_amount_and_units(amount))
+        b = Factory.OutputItem()
+        b.address = address
+        b.value = self.app.format_amount_and_units(amount)
         self.add_widget(b)