tests: stabilize `test-http-bad-server.t` on macOS
I'm not sure what's going on here, because I got one test run where this worked,
but two where it gave this error instead. It's connection related as the
comment says it should be, so good enough.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
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