Add gl-form-input class for fields in github import page

app/views/import/github/new.html.haml

@@ -23,7 +23,7 @@
 = form_tag personal_access_token_import_github_path, method: :post do
   .form-group
     %label.label-bold= _('Personal Access Token')
-    = text_field_tag :personal_access_token, '', class: 'form-control', placeholder: _('e.g. %{token}') % { token: '8d3f016698e...' }, data: { qa_selector: 'personal_access_token_field' }
+    = text_field_tag :personal_access_token, '', class: 'form-control gl-form-input', placeholder: _('e.g. %{token}') % { token: '8d3f016698e...' }, data: { qa_selector: 'personal_access_token_field' }
     %span.form-text.text-muted
       = import_github_personal_access_token_message