subrepo: drop the default value of None for the archive matcher
This was flagged by pytype after adding hints to `match.subdirmatcher` that it
takes a non-optional matcher. That matcher argument is used without a guard in
the subdirmatcher constructor, so that's the correct restriction.
I don't think this fixes a bug in practice because the only way these are
invoked is either by a parent `hgsubrepo.archive()`, `archival.archive()`, or
the largefiles override of these. The `hgsubrepo.archive()` case (and the
largefiles override) uses what the caller provided, so the caller will
eventually be `archival.archive()` (or the largfiles override) up the call
chain. The `archival.archive()` method also has None for its matcher's default
arg. However, the three callers of that (`commands.archive()`,
`webcommands.archive()`, and `extdiff.snapshot()`) all provide a matcher
argument, so the None case can never occur unless a 3rd party extension swaps it
for None. Sadly, we can't make the argument on the `archival.archive()`
non-optional because there is a kwarg prior to it.
Even though the largefiles override of `archival.archive()` is provided a valid
matcher, we duplicate the internal creation of the matcher that the original
`archival.archive()` does for consistency. By eliminating an impossible to hit
case, we can simplify some of the subrepo code too, by dropping unreachable
code.
# See http://EditorConfig.org for the specification
root = true
[*.py]
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indent_style = space
trim_trailing_whitespace = true
end_of_line = lf
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
end_of_line = lf
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false
end_of_line = lf