Remove unused empty state view.

ee/app/views/shared/empty_states/service_desk.html.haml

-- button_path = local_assigns.fetch(:button_path, false)
-- project_select_button = local_assigns.fetch(:project_select_button, false)
-- has_button = button_path || project_select_button
-
-.row.empty-state
-  .col-xs-12
-    .svg-content
-      = render 'shared/empty_states/icons/issues.svg'
-  .col-xs-12.text-center
-    .text-content
-      - if has_button && current_user
-        %h4
-          The Issue Tracker is the place to add things that need to be improved or solved in a project
-        %p
-          Issues can be bugs, tasks or ideas to be discussed.
-          Also, issues are searchable and filterable.
-        - if project_select_button
-          = render 'shared/new_project_item_select', path: 'issues/new', label: 'New issue', type: :issues
-        - else
-          = link_to 'New issue', button_path, class: 'btn btn-new', title: 'New issue', id: 'new_issue_link'
-      - else
-        .text-center
-          %h4 There are no issues to showwwwwwww.