[gimp] Issue #7169: add app/core/gimppattern-save.c in POTFILES.in.

[Jehan <jehanp src gnome org>]

commit 714e911851c073a21ba6e71e92a4b8b339f813ff
Author: Jehan <jehan girinstud io>
Date:   Mon Aug 23 18:38:16 2021 +0200

    Issue #7169: add app/core/gimppattern-save.c in POTFILES.in.
    
    Since commit f130fe1917, this source file has translated text, hence
    should be included in files checked for translations.

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index f8dc1c4e6a..8ae259fcd9 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -186,6 +186,7 @@ app/core/gimppalette-save.c
 app/core/gimppalettemru.c
 app/core/gimppattern.c
 app/core/gimppattern-load.c
+app/core/gimppattern-save.c
 app/core/gimppatternclipboard.c
 app/core/gimppdbprogress.c
 app/core/gimpprogress.c