Fix consistency issue in sidebars of Project and Group Settings.

app/controllers/groups_controller.rb

app/helpers/groups_helper.rb

app/views/groups/edit.html.haml

app/views/layouts/group.html.haml

app/views/layouts/group_settings.html.haml

app/views/layouts/nav/_group.html.haml

app/views/layouts/nav/_group_settings.html.haml

app/views/layouts/nav/_project.html.haml

app/views/layouts/nav/_project_settings.html.haml

features/steps/project/active_tab.rb