[gnome-photos] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit d7c6a7733bd545f327d06223023ccaec84f85547
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Tue Feb 14 18:59:36 2017 +0100

    Update POTFILES.in

 po/POTFILES.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 29604bf..fc4161c 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -40,6 +40,7 @@ src/photos-share-point-email.c
 src/photos-share-point-google.c
 src/photos-source-manager.c
 src/photos-spinner-box.c
+src/photos-thumbnailer.c
 src/photos-tool-colors.c
 src/photos-tool-crop.c
 src/photos-tool-enhance.c