OAuth flow only selected scopes should be sent to Authorize endpoint #1388.

Need to clear out previous popupDialog nodes, so previous checkboxes won't be considered.

lib/swagger-oauth.js

@@ -40,6 +40,7 @@ function handleLogin() {
     appName = window.swaggerUi.api.info.title;
   }
 
+  $('.api-popup-dialog').remove(); 
   popupDialog = $(
     [
       '<div class="api-popup-dialog">',