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>

config.c

@@ -2624,7 +2624,7 @@ int git_config_set_multivar_in_file_gently(const char *config_filename,
 			} else
 				copy_end = find_beginning_of_line(
 					contents, contents_sz,
-					store.offset[i]-2, &new_line);
+					store.offset[i], &new_line);
 
 			if (copy_end > 0 && contents[copy_end-1] != '\n')
 				new_line = 1;