Add closing of the user name addition window when opening the attached document

[amochalov85]

For test: https://github.com/ONLYOFFICE/testing-onlyoffice/blob/63c31213625d29fde478e0575aedffddb96b7d87/spec/portals/mail/mail_attachmments/mail_attachments_from_my_docs_spec.rb#L42