Fix XML errors in some gnome wallpaper description files. (Closes: #862228)

debian/changelog

@@ -1,5 +1,7 @@
 desktop-base (10.0.0~exp1) UNRELEASED; urgency=medium
 
+  * Fix XML errors in some gnome wallpaper description files.
+    (Closes: #862228)
   * Build with debhelper, bump compatibility level to 10, drop CDBS build
     dependency.
   * Add autopkgtests to validate XMLs structure and avoid bugs like #862228.

joy-inksplat-theme/gnome-wp-list.xml

@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
 <wallpapers>
-  <wallpaper>
-    <!-- don't include words such as "wallpaper" (avoids translations) -->
+  <!-- don't include words such as "wallpaper" (avoids translations) -->
   <wallpaper>
     <name>Joy Inksplat</name>
     <filename>/usr/share/desktop-base/joy-inksplat-theme/wallpaper/gnome-background.xml</filename>

joy-theme/gnome-wp-list.xml

@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE wallpapers SYSTEM "gnome-wp-list.dtd">
 <wallpapers>
-  <wallpaper>
-    <!-- don't include words such as "wallpaper" (avoids translations) -->
+  <!-- don't include words such as "wallpaper" (avoids translations) -->
   <wallpaper>
     <name>Joy</name>
     <filename>/usr/share/desktop-base/joy-theme/wallpaper/gnome-background.xml</filename>