Merge branch 'md/sort-detached-head-first'

"git branch --list" learned to always output the detached HEAD as
the first item (when the HEAD is detached, of course), regardless
of the locale.

* md/sort-detached-head-first:
ref-filter: sort detached HEAD lines firstly

diff --cc ref-filter.c
Simple merge

diff --cc wt-status.c
Simple merge

diff --cc wt-status.h
Simple merge