Removes dup dropdown

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

@@ -3,7 +3,6 @@
     - params[:label_name].each do |label|
       = hidden_field_tag "label_name[]", label, id: nil
 .dropdown
-  %button.dropdown-menu-toggle.js-label-select.js-filter-submit.js-extra-options{type: "button", data: {toggle: "dropdown", field_name: "label_name", show_no: "true", show_any: "true", selected: params[:label_name], project_id: @project.try(:id), labels: labels_filter_path, default_label: "Label"}}
   %button.dropdown-menu-toggle.js-label-select.js-filter-submit.js-multiselect.js-extra-options{type: "button", data: {toggle: "dropdown", field_name: "label_name[]", show_no: "true", show_any: "true", selected: params[:label_name], project_id: @project.try(:id), labels: labels_filter_path, default_label: "Label"}}
     %span.dropdown-toggle-text
       = h(multi_label_name(params[:label_name], "Label"))