git_config_set: fix off-by-two

Currently, we are slightly overzealous When removing an entry from a config file of this form: [abc]a [xyz] key = value When calling `git config --unset abc.a` on this file, it leaves this (invalid) config behind: [ [xyz] key = value The reason is that we try to search for the beginning of the line (or for the end of the preceding section header on the same line) that defines abc.a, but as an optimization, we subtract 2 from the offset pointing just after the definition before we call find_beginning_of_line(). That function, however, *also* performs that optimization and promptly fails to find the section header correctly. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>