Stop pagination elements from overflowing outside of panel container

[ray-curran]

When a paginated table is placed inside a panel, the pagination elements
are floated and overflow outside the panel. Adding clearfix expands the
panel to include the pagination elements.

Fixes #6880

Before:

After:

To Replicate:

• Update dashboard.rb with the following content:

# frozen_string_literal: true
ActiveAdmin.register_page 'Dashboard' do
  menu priority: 1, label: proc { I18n.t('active_admin.dashboard') }

  content title: proc { I18n.t('active_admin.dashboard') } do
    if current_admin_user.super_admin?
      columns do
        column do
          panel 'Updated contents by Admins' do
            paginated_collection(Post.all.order(id: :desc).page(params[:page]).per(2), download_links: true) do
              table_for(collection, sortable: false) do
                column 'Item', :item
                column(:item_type) { |v| v.title }
                column 'Event', :event
                column('Modified At') { |v| (v.created_at.to_s :long).html_safe }
              end
            end
          end
        end
      end
    end
  end
end

[deivid-rodriguez]

Looks good to me!

[javierjulio]

Thanks!