[QA] Fix a wrong constant name

The Menu namespace was changed in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22115 and
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7799.

Fixes https://gitlab.com/gitlab-org/quality/nightly/issues/22.
Signed-off-by: NRémy Coutable <remy@rymai.me>

qa/qa/specs/features/browser_ui/3_create/repository/add_file_template_spec.rb

@@ -18,7 +18,7 @@ module QA
           project.description = 'Add file templates via the Files view'
         end
 
-        Page::Menu::Main.act { sign_out }
+        Page::Main::Menu.act { sign_out }
       end
 
       templates = [

qa/qa/specs/features/browser_ui/3_create/web_ide/add_file_template_spec.rb

@@ -27,7 +27,7 @@ module QA
           page.commit_changes
         end
 
-        Page::Menu::Main.act { sign_out }
+        Page::Main::Menu.act { sign_out }
       end
 
       templates = [

qa/qa/specs/features/browser_ui/7_configure/auto_devops/create_project_with_auto_devops_spec.rb

@@ -66,7 +66,7 @@ module QA
               expect(pipeline).to have_build('production', status: :success, wait: 1200)
             end
 
-            Page::Menu::Side.act { click_operations_environments }
+            Page::Project::Menu.act { click_operations_environments }
             Page::Project::Operations::Environments::Index.perform do |index|
               index.go_to_environment('production')
             end