generate-cmdlist.sh: stop sorting category lines

generate-cmdlist.sh: stop sorting category lines

In a preceding commit we changed the print_command_list() loop to use
printf's auto-repeat feature. Let's now get rid of get_category_line()
entirely by not sorting the categories.

This will change the output of the generated code from e.g.:

    -       { "git-apply", N_("Apply a patch to files and/or to the index"), 0 | CAT_complete | CAT_plumbingmanipulators },

To:

    +       { "git-apply", N_("Apply a patch to files and/or to the index"), 0 | CAT_plumbingmanipulators | CAT_complete },

I.e. the categories are no longer sorted, but as they're OR'd together
it won't matter for the end result.

This speeds up the generate-cmdlist.sh a bit. Comparing HEAD~ (old)
and "master" to this code:

  'sh generate-cmdlist.sh command-list.txt' ran
    1.07 ± 0.33 times faster than 'sh generate-cmdlist.sh.old command-list.txt'
    1.15 ± 0.36 times faster than 'sh generate-cmdlist.sh.master command-list.txt'

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>