[gnome-photos] Update to latest libgd

[Debarshi Ray <debarshir src gnome org>]

commit 31be5bd2ea235e0d67c2d2b9745b9818c6cf4797
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri May 12 17:41:28 2017 +0200

    Update to latest libgd
    
    Silences deprecation warnings from the GdkDeviceManager API and
    gtk_paint_spinner.

 libgd |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgd b/libgd
index cc90107..3afb334 160000
--- a/libgd
+++ b/libgd
@@ -1 +1 @@
-Subproject commit cc90107531640bcba6c3c58e5cf6aec94d498763
+Subproject commit 3afb334ed1d87580df0adf34c8ed6c31e5d3d667