[recipes] Simplify the sandbox check

[Matthias Clasen <matthiasc src gnome org>]

commit 0fc8725065fda3f63cf7e7405db0f11b60d23ff7
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jan 16 10:00:25 2017 -0500

    Simplify the sandbox check
    
    No need to create a path, /.flatpak-info is at a fixed location.
    Pointed out by Alex Larsson.

 src/gr-app.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/src/gr-app.c b/src/gr-app.c
index 46232b0..01254f2 100644
--- a/src/gr-app.c
+++ b/src/gr-app.c
@@ -223,11 +223,7 @@ add_built_logo (GtkAboutDialog *about)
 static gboolean
 in_flatpak_sandbox (void)
 {
-        g_autofree char *path = NULL;
-
-        path = g_build_filename (g_get_user_runtime_dir (), "flatpak-info", NULL);
-
-        return g_file_test (path, G_FILE_TEST_EXISTS);
+        return g_file_test ("/.flatpak-info", G_FILE_TEST_EXISTS);
 }
 
 static void