[gnome-screenshot] Fix the variant type for -f option

[Cosimo Cecchi <cosimoc src gnome org>]

commit 9aa397c5640ad192806898a3b4f25b31df86ef1e
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Aug 25 11:37:51 2014 -0400

    Fix the variant type for -f option
    
    Filename arguments are transmitted as bytestrings.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=735323

 src/screenshot-application.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/screenshot-application.c b/src/screenshot-application.c
index 96f328e..84e6467 100644
--- a/src/screenshot-application.c
+++ b/src/screenshot-application.c
@@ -685,7 +685,7 @@ screenshot_application_command_line (GApplication            *app,
   g_variant_dict_lookup (options, "interactive", "b", &interactive_arg);
   g_variant_dict_lookup (options, "border-effect", "&s", &border_effect_arg);
   g_variant_dict_lookup (options, "delay", "i", &delay_arg);
-  g_variant_dict_lookup (options, "file", "&s", &file_arg);
+  g_variant_dict_lookup (options, "file", "^&ay", &file_arg);
 
   res = screenshot_load_config (clipboard_arg,
                                 window_arg,