Remove container_class in project activity which removes extra padding

app/views/projects/_activity.html.haml

 - is_project_overview = local_assigns.fetch(:is_project_overview, false)
 
-%div{ class: container_class }
-  .nav-block.d-none.d-sm-flex.activities.gl-static
+.nav-block.d-none.d-sm-flex.activities.gl-static
   = render 'shared/event_filter'
   .controls.gl-display-flex
     = link_to project_path(@project, rss_url_options), title: s_("ProjectActivityRSS|Subscribe"), class: 'btn gl-button btn-default btn-icon d-none d-sm-inline-flex has-tooltip' do
@@ -10,6 +9,6 @@
       .project-clone-holder.d-none.d-md-inline-flex.gl-ml-2
         = render "projects/buttons/clone", dropdown_class: 'dropdown-menu-right'
 
-  .content_list.project-activity{ :"data-href" => activity_project_path(@project) }
-  .loading
+.content_list.project-activity{ :"data-href" => activity_project_path(@project) }
+.loading
   .spinner.spinner-md