[evince] shell: Update default app icon name

[Germán Poo-Caamaño <gpoo src gnome org>]

commit af584017eb45d7a58b4a9b3d2d235e69360460df
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Sun Aug 19 18:02:53 2018 -0400

    shell: Update default app icon name
    
    This doesn't appear necessary with GNOME Shell, but
    we might as well update this line if we're going to keep it.

 shell/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/shell/main.c b/shell/main.c
index 0901ff75..6c54078b 100644
--- a/shell/main.c
+++ b/shell/main.c
@@ -296,7 +296,7 @@ main (int argc, char *argv[])
 
        /* Manually set name and icon */
        g_set_application_name (_("Document Viewer"));
-       gtk_window_set_default_icon_name ("evince");
+       gtk_window_set_default_icon_name ("org.gnome.Evince");
 
         application = ev_application_new ();
         if (!g_application_register (G_APPLICATION (application), NULL, &error)) {