Duplicate SAMEORIGIN in frame middleware

[alexjustesen]

Update was done, but next error messages are here:

Refused to display 'XXXX' in a frame because it set multiple 'X-Frame-Options' headers with conflicting values ('ALLOW-FROM SAMEORIGIN, SAMEORIGIN'). Falling back to 'deny'

Unchecked runtime.lastError: A listener indicated an asynchronous response by returning true, but the message channel closed before a response was received

Originally posted by @ZoXx in #752 (comment)