Fix code style issue

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/admin/identities/_form.html.haml

 = form_for [:admin, @user, @identity], html: { class: 'form-horizontal fieldset-form' } do |f|
-  -if @identity.errors.any?
+  - if @identity.errors.any?
     #error_explanation
       .alert.alert-danger
         - @identity.errors.full_messages.each do |msg|