Fix a haml_lint whitespace error

app/views/projects/mirrors/pull/_authentication_method.html.haml

@@ -23,7 +23,6 @@
       An SSH key will be automatically generated when the form is
       submitted. For more information, please refer to the documentation.
 
-
     .clearfix.js-ssh-public-key-wrap{ class: ('hidden' unless ssh_public_key_present) }
       %code.prepend-top-10.ssh-public-key
         = import_data.ssh_public_key