bisect: use standard one-line commit summary This makes bisect use the standardized support for one-line commit summary I added a while back. That means that it will respect the `command-templates.oneline-summary` config. If also means that the default output now includes the first line of the commit message (see test impact). Differential Revision: https://phab.mercurial-scm.org/D10245

edition = "2018"
max_width = 79
wrap_comments = true
error_on_line_overflow = true