rhg: look for repository in ancestors also instead of cwd only
Last patch introduced config reading at startup to parse value of `--repository`
flag. However, that patch only tried to check for current repository at current
working directory and not it's ancestors. This patch fixes that.
Differential Revision: https://phab.mercurial-scm.org/D10767
edition = "2018"
max_width = 79
wrap_comments = true
error_on_line_overflow = true