Issue closing pattern (keyword) failing
### Expected When using specific [keywords](https://docs.gitlab.com/ce/user/project/issues/automatic_issue_closing.html#default-closing-pattern-value) in merge requests' descriptions, when we merge it, it closes the specified issue. ### Problem Not working: when we merge the MR the issue keeps opened. ### Example [MR description](https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/4647)'s say `closes #xxx`, was merged, but the [issue](https://gitlab.com/gitlab-com/blog-posts/issues/301) is still opened. Mind that issue is not in the same project as the MR.
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