[gnome-boxes] appdata: Use appid variable

[Felipe Borges <felipeborges src gnome org>]

commit 6ada7f4e5f5cc8aa89358627f29dee32b5c7f465
Author: Felipe Borges <felipeborges gnome org>
Date:   Mon May 30 12:29:55 2022 +0200

    appdata: Use appid variable
    
    For unstable Flatpak builds the appid changes to BoxesDevel. We
    were already setting the appid configuration in meson but not
    using the variable in the appdata file.

 data/org.gnome.Boxes.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.Boxes.appdata.xml.in b/data/org.gnome.Boxes.appdata.xml.in
index cd73e083..f14c1d14 100644
--- a/data/org.gnome.Boxes.appdata.xml.in
+++ b/data/org.gnome.Boxes.appdata.xml.in
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Copyright 2019 Red Hat, Inc -->
 <component type="desktop">
-  <id>org.gnome.Boxes.desktop</id>
+  <id>@appid@.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>LGPL-2.1+</project_license>
   <name>Boxes</name>