Remove page-specific GLForm init and add support_autocomplete: false local to...

Remove page-specific GLForm init and add support_autocomplete: false local to groups/milestones/_form

app/assets/javascripts/dispatcher.js

@@ -234,7 +234,6 @@ import DueDateSelectors from './due_date_select';
         case 'groups:milestones:update':
           new ZenMode();
           new DueDateSelectors();
-          new GLForm($('.milestone-form'), true);
           break;
         case 'projects:compare:show':
           new gl.Diff();

app/views/groups/milestones/_form.html.haml

@@ -11,7 +11,7 @@
         = f.label :description, "Description", class: "control-label"
         .col-sm-10
           = render layout: 'projects/md_preview', locals: { url: group_preview_markdown_path } do
-            = render 'projects/zen', f: f, attr: :description, classes: 'note-textarea', placeholder: 'Write milestone description...'
+            = render 'projects/zen', f: f, attr: :description, classes: 'note-textarea', placeholder: 'Write milestone description...', supports_autocomplete: false
             .clearfix
             .error-alert