minor fix logout

app/frontwindow.py

@@ -113,7 +113,7 @@ class FrontWindow(QMainWindow):
         response = dialog.exec_()
         if response == DIALOG_REPLY_YES:
             # self.check_empty_sale() This function cancels sale if it has not number
-            logout({'context': self.ctx})
+            logout(self.ctx)
             if self.active_weighing and self.reader_thread:
                 self.reader_thread.onClose()
             super(FrontWindow, self).close()

app/proxy.py

@@ -46,11 +46,11 @@ def logout(ctx):
     else:
         conn = HTTPSConnection(host, port=port, context=context_http)
     url = '/' + db + '/logout'
-    payload = json.dumps(
-        {
+    payload = json.dumps({'context': {
         'session':ctx.get('session'),
         'login': ctx.get('login')
-        }, 
+        }}
+        , 
         default=encoder)
     conn.request('POST', url, body=payload, headers=HEADERS)
     response = conn.getresponse()