[gnome-boxes] Make Machine::get_screenshot_filename private

[Christophe Fergeau <teuf src gnome org>]

commit 571fcd1a30955e183cf6e58b986217683a474d3b
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Tue Sep 11 12:35:49 2012 +0200

    Make Machine::get_screenshot_filename private
    
    It's only used in machine.vala
    
    https://bugzilla.gnome.org/show_bug.cgi?id=683792

 src/machine.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/machine.vala b/src/machine.vala
index dc23ca5..871e66a 100644
--- a/src/machine.vala
+++ b/src/machine.vala
@@ -198,7 +198,7 @@ private abstract class Boxes.Machine: Boxes.CollectionItem, Boxes.IPropertiesPro
         }
     }
 
-    public string get_screenshot_filename () {
+    private string get_screenshot_filename () {
         return Boxes.get_screenshot_filename (config.uuid);
     }