t3200: avoid variations of the `master` branch name
To avoid branch names with a loaded history, we already started to avoid using the name "master" in a couple instances. The `t3200-branch.sh` script uses variations of this name for branches other than the default one. So let's change those names, as "lowest-hanging fruits" in the effort to use more inclusive naming throughout Git's source code. While at it, make those branch names independent from the default branch name. In this particular instance, this rename requires a couple of non-trivial adjustments, as the aligned output depends on the maximum length of the displayed branches (which we now changed), and also on the alphabetical order (which we now changed, too). Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>