hg: show the correct message when cloning an LFS repo with extension disabled The `extensions._disabledpaths()` doesn't handle fetching help from `__index__`, so it returns an empty dictionary of paths. That means None is always returned from `extensions.disabled_help()` when embedding resources inside the pyoxidizer or py2exe binary, regardless of the arg or if is an external extension stored in the filesystem. And that means wrongly telling the user with an explicitly disabled LFS extension that it will be enabled locally upon cloning from an LFS remote. That causes test-lfs-serve.t:295 to fail. This effectively reverts most of the rest of 843418dc0b1b, while keeping the help text change in place (which was specifically identified as a problem).

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    "phabricator.uri": "https://phab.mercurial-scm.org/",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
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