[dia] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 23e656ede2c416838c4280d80cd9f63bbc6800bd
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Oct 17 11:13:39 2020 +0200

    Update POTFILES.in

 po/POTFILES.in | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 6d5b38d0b..4c4c8d59f 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -249,7 +249,6 @@ plug-ins/python/dot2dia.py
 plug-ins/python/doxrev.py
 plug-ins/python/export-object.py
 plug-ins/python/export-render.py
-plug-ins/python/group_props.py
 plug-ins/python/gtkcons.py
 plug-ins/python/imgmap.py
 plug-ins/python/mark-cps.py