[gnome-builder] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit 9b5e1db4b6c6c31f1a067c7d81c977f3f48f44b5
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Aug 6 13:21:51 2022 +0200

    Update POTFILES.skip

 po/POTFILES.skip | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index e13a140fb..77734f804 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -2,6 +2,7 @@
 # Please keep this file sorted alphabetically.
 data/appdata/org.gnome.Builder.appdata.xml.in
 data/org.gnome.Builder.desktop.in
+src/libide/tweaks/demo
 src/libide/tweaks/tests
 src/plugins/color-picker/gstyle/tests/data/gstyle-color-editor.ui
 src/plugins/color-picker/gstyle/tests/data/palette.xml