[gnome-boxes] POTFILES: Don't refer to a non-existent file

[Felipe Borges <felipeborges src gnome org>]

commit 7f1b7b9ea7d69666eb54ae8b4a12ba60aee28399
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Aug 16 17:19:26 2017 +0200

    POTFILES: Don't refer to a non-existent file
    
    There was never a data/org.gnome.boxes.gschema.xml.in.in in the entire
    history of the project.
    
    Fallout from 4dcc15ffea420eaa548e56fd81509416a9d51ace
    
    https://bugzilla.gnome.org/show_bug.cgi?id=783832

 po/POTFILES.skip |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 9254235..078958d 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -3,7 +3,6 @@
 data/org.gnome.Boxes.desktop.in
 # Have to list it twice because of a intltool bug
 sub/data/org.gnome.Boxes.desktop.in
-data/org.gnome.boxes.gschema.xml.in.in
 src/actions-popover.c
 src/app.c
 src/app-window.c