Fix click on incorrect namespace

in certain conditions. And `first` was causing it to succeed even though the criteria were ambiguous.

qa/qa/page/project/new.rb

@@ -4,7 +4,7 @@ module QA
       class New < Page::Base
         view 'app/views/projects/_new_project_fields.html.haml' do
           element :project_namespace_select
-          element :project_namespace_field, 'select :namespace_id'
+          element :project_namespace_field, /select :namespace_id.*class: 'select2/
           element :project_path, 'text_field :path'
           element :project_description, 'text_area :description'
           element :project_create_button, "submit 'Create project'"
@@ -13,7 +13,7 @@ module QA
         def choose_test_namespace
           click_element :project_namespace_select
 
-          first('li', text: Runtime::Namespace.path).click
+          find('ul.select2-result-sub > li', text: Runtime::Namespace.path).click
         end
 
         def choose_name(name)