fix(nixos/git-server): Use the correct number in the `section-from-path` setting

Take for example a repository name like: `some/organisation/project_a/team_c/repo_b`.
Setting the setting to `-1` means that cgit traverses the path from left
to right, until it has found 1 element (and `section-from-path` (or n
for short)is 0, because n is incremented after each iteration). E.g. :
                                                                    ~ [n=-1]
starting point:            `some/organisation/project_a/team_c/repo_b`
                                                              ~ [n=0]
after the first iteration: `some/organisation/project_a/team_c/repo_b`

Now `some/organisation/project_a/team_c` becomes the section, whilst
`repo_b` becomes the repo name.

0 files changed, 0 insertions, 0 deletions