[gnome-photos] application: Add gegl:pixbuf to the list of required operations

[Debarshi Ray <debarshir src gnome org>]

commit 821dc8c57a7dddcaf071aa06a03e7af67dbeff91
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Feb 13 20:56:55 2017 +0100

    application: Add gegl:pixbuf to the list of required operations
    
    We are going to use it in our custom thumbnailer in the following
    patches.

 src/photos-application.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-application.c b/src/photos-application.c
index 97dcc67..1d11584 100644
--- a/src/photos-application.c
+++ b/src/photos-application.c
@@ -157,6 +157,7 @@ static const gchar *REQUIRED_GEGL_OPS[] =
   "gegl:gray",
   "gegl:load",
   "gegl:nop",
+  "gegl:pixbuf",
   "gegl:rotate-on-center",
   "gegl:save-pixbuf",
   "gegl:scale-ratio",