Returns title of the page even if title name same as the site name
Returns title of the page even if title name same as the site name

* Adds `self.article.opengraph['site_name'] != title` condition

`if "site_name" in list(self.article.opengraph.keys()):` ->
`if "site_name" in list(self.article.opengraph.keys()) and self.article.opengraph['site_name'] != title:`

Closes https://github.com/goose3/goose3/issues/116

goose3/goose,goose3/goose3,goose3/goose,goose3/goose3