Refactor js that disable form submit if no members selected

app/assets/javascripts/members.js.es6

@@ -10,6 +10,7 @@
       $('.project_member, .group_member').off('ajax:success').on('ajax:success', this.removeRow);
       $('.js-member-update-control').off('change').on('change', this.formSubmit);
       $('.js-edit-member-form').off('ajax:success').on('ajax:success', this.formSuccess);
+      disableButtonIfEmptyField('#user_ids', 'input[name=commit]', 'change');
     }
 
     removeRow(e) {

app/views/groups/group_members/index.html.haml

@@ -29,6 +29,3 @@
     %ul.content-list
       = render partial: 'shared/members/member', collection: @members, as: :member
     = paginate @members, theme: 'gitlab'
-
-:javascript
-  window.disableButtonIfEmptyField('#user_ids', 'input[name=commit]', 'change');

app/views/projects/project_members/index.html.haml

@@ -26,6 +26,3 @@
 
   = render 'team', members: @project_members
   = paginate @project_members, theme: "gitlab"
-
-:javascript
-  window.disableButtonIfEmptyField('#user_ids', 'input[name=commit]', 'change');