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completion: simplify "current branch" in __git_ps1()
As I very often work on a detached HEAD, I found it pretty confusing
when __git_ps1() said 'some-name'. Did I create a branch with that name
by mistake, or do I happen to be on a commit with that exact tag?
This patch fixes the issue by enclosing non branch names in a pair of
parentheses when used to substitute %s token in __git_ps1() argument.
It also fixes a small bug where the branch part is left empty when
.git/HEAD is unreadable for whatever reason. The output now says
"(unknown)".
Signed-off-by: Junio C Hamano <gitster@pobox.com>