lib/scanner: Never, ever descend into symlinks (ref #3857)

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On Windows we would descend into SYMLINKD type links when we scanned
them successfully, as we would return nil from the walk function and the
filepath.Walk iterator apparently thought it OK to descend into the
symlinked directory.

With this change we always return filepath.SkipDir no matter what.

Tested on Windows 10 as admin, does what it should.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3875

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