main: Don’t print translation header with `--help`

The correct way to tell g_option_context_new() not to print any information after the options is to pass NULL. Passing the empty string results in a call to gettext (""), which returns the translation’s header.

This fixes the output of accounts-daemon --help.

Signed-off-by: Philip Withnall withnall@endlessm.com

╎❯ /usr/libexec/accounts-daemon --help
Usage:
  accounts-daemon [OPTION…] Project-Id-Version: accounts service
Report-Msgid-Bugs-To: 
PO-Revision-Date: 2019-02-22 14:19+0000
Last-Translator: halfline <halfline@gmail.com>
Language-Team: English (http://www.transifex.com/freedesktop/accountsservice/language/en/)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Language: en
Plural-Forms: nplurals=2; plural=(n != 1);
...

EEK!

merged

Also fixed in GLib as: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1469