[gimp] libgimp: export_comment values was not set in libgimp.

[Jehan <jehanp src gnome org>]

commit 636044a0c333bf14d516634cf7264cb9df8e47f3
Author: Jehan <jehan girinstud io>
Date:   Fri Nov 13 23:54:40 2020 +0100

    libgimp: export_comment values was not set in libgimp.
    
    As a consequence gimp_export_comment() was always returning FALSE even
    when we set it to TRUE in Preferences.

 libgimp/gimp.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/libgimp/gimp.c b/libgimp/gimp.c
index ae12b9b141..e964e263e5 100644
--- a/libgimp/gimp.c
+++ b/libgimp/gimp.c
@@ -1131,6 +1131,7 @@ _gimp_config (GPConfig *config)
   _export_exif          = config->export_exif      ? TRUE : FALSE;
   _export_xmp           = config->export_xmp       ? TRUE : FALSE;
   _export_iptc          = config->export_iptc      ? TRUE : FALSE;
+  _export_comment       = config->export_comment;
   _default_display_id   = config->default_display_id;
   _wm_class             = g_strdup (config->wm_class);
   _display_name         = g_strdup (config->display_name);