Default GitLab merge request target

[Alex Henrie]

Would it be possible to make merge requests from forked Wine projects
target the upstream Wine project by default, as described at [1]? I
just accidentally created a merge request to merge my own topic branch
into my own master branch, because for some reason that's the default
when you click the "Create merge request" button in the "You pushed to
<topic branch> just now" banner.

-Alex

[1] https://docs.gitlab.com/14.10/ee/user/project/merge_requests/creating_merge_...