prompt: fix untracked files for zsh
We signal presense of untracked files by adding a per-cent sign '%' to the prompt. But because '%' is used as an escape character to introduce prompt customization in zsh (just like bash prompt uses '\' to escape '\u', '\h', etc.), we need to say '%%' to get a literal per-cent. Helped-by: NAndreas Schwab <schwab@linux-m68k.org> Signed-off-by: NFelipe Contreras <felipe.contreras@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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