Removed ID from button as frontend doesnt use anymore

app/views/shared/issuable/_sidebar.html.haml

@@ -9,7 +9,7 @@
       %a.gutter-toggle.pull-right.js-sidebar-toggle{ role: "button", href: "#", aria: { label: "Toggle sidebar" } }
         = sidebar_gutter_toggle_icon
       - if current_user
-        %button.btn.btn-default.issuable-header-btn.pull-right.js-issuable-todo{ type: "button", aria: { label: (todo.nil? ? "Add Todo" : "Mark Done") }, data: { todo_text: "Add Todo", mark_text: "Mark Done", id: (todo.id unless todo.nil?), issuable: issuable.id, issuable_type: issuable.class.name.underscore, url: namespace_project_todos_path(@project.namespace, @project), delete_path: (dashboard_todo_path(todo) if todo) } }
+        %button.btn.btn-default.issuable-header-btn.pull-right.js-issuable-todo{ type: "button", aria: { label: (todo.nil? ? "Add Todo" : "Mark Done") }, data: { todo_text: "Add Todo", mark_text: "Mark Done", issuable: issuable.id, issuable_type: issuable.class.name.underscore, url: namespace_project_todos_path(@project.namespace, @project), delete_path: (dashboard_todo_path(todo) if todo) } }
           %span.js-issuable-todo-text
             - if todo
               Mark Done