[gimp] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit b1df7d5497f72fc04883b27eecc1b1b1a0025f38
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Apr 19 19:52:20 2018 +0200

    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 a536bc7..84e982d 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -575,6 +575,7 @@ app/widgets/gimppickablepopup.c
 app/widgets/gimppluginview.c
 app/widgets/gimpprogressdialog.c
 app/widgets/gimppropwidgets.c
+app/widgets/gimpsamplepointeditor.c
 app/widgets/gimpsavedialog.c
 app/widgets/gimpsearchpopup.c
 app/widgets/gimpselectiondata.c