use resize_window helper

spec/features/boards/boards_spec.rb

@@ -2,6 +2,7 @@ require 'rails_helper'
 
 describe 'Issue Boards', :js do
   include DragTo
+  include MobileHelpers
 
   let(:group) { create(:group, :nested) }
   let(:project) { create(:project, :public, namespace: group) }
@@ -564,7 +565,7 @@ describe 'Issue Boards', :js do
 
   def drag(selector: '.board-list', list_from_index: 0, from_index: 0, to_index: 0, list_to_index: 0)
     # ensure there is enough horizontal space for four boards
-    page.current_window.resize_to(2000, 800)
+    resize_window(2000, 800)
 
     drag_to(selector: selector,
             scrollable: '#board-app',