Merge branch 'kn/ref-filter-branch-list'

"git branch --list" takes the "--abbrev" and "--no-abbrev" options
to control the output of the object name in its "-v"(erbose)
output, but a recent update started ignoring them; this fixes it
before the breakage reaches to any released version.

* kn/ref-filter-branch-list:
branch: honor --abbrev/--no-abbrev in --list mode

diff --cc builtin/branch.c
Simple merge

diff --cc t/t3200-branch.sh
Simple merge