lfs: don't automatically exclude '.hg*' files from external tracking
The only reasons I did this in the first place was because tracking externally
seems like it would always be a mistake, and the eol extension does the same
thing. Yuya and Jun thought it might be better to not do this[1], so I'll defer
to them on this. If a problem with say, .hgtags or .hgeol does arise, it can be
added back without breaking existing repos.
[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2018-January/110371.html
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