Fix unit test that expected class="gridster"

Author: kinow

test/app_test.rb

@@ -91,7 +91,7 @@ def test_get_dashboard
     with_generated_project do
       get '/sampletv'
       assert_equal 200, last_response.status
-      assert_includes last_response.body, 'class="gridster"'
+      assert_includes last_response.body, 'class="grid"'
       assert_includes last_response.body, "DOCTYPE"
     end
   end