remove "add work package" button

Because it is not angular based and as such lacks the ability to select the type before opening the form.

app/views/my_projects_overviews/blocks/_work_package_tracking.html.erb

@@ -43,13 +43,6 @@ See doc/COPYRIGHT.md for more details.
       <% if User.current.allowed_to?(:view_gantt, project, :global => true) %>
         <%= link_to(l(:label_gantt), {:controller => '/gantts', :action => 'show', :project_id => project}, :class => 'button -highlight') %>
       <% end %>
-      <%= link_to new_project_work_packages_path(project),
-            { class: 'button -alt-highlight',
-              title: t(:label_keyboard_shortcut_new_work_package),
-              aria: { label: t(:label_keyboard_shortcut_new_work_package) }} do %>
-        <%= op_icon('button--icon icon-add') %>
-        <span class="button--text"><%= l('activerecord.models.work_package') %></span>
-      <% end %>
     </p>
   </div>
 <% end %>