debian/changelog: and fix the bugnumber (thanks to jackyf

debian/changelog

@@ -19,7 +19,7 @@ apt (0.7.20) unstable; urgency=low
     build-dep packages as automatic installed. 
     This is controlled via the value of
     APT::Get::Build-Dep-Automatic and is set "false" by default.  
-    Thanks to Aaron Haviland, closes: #44874
+    Thanks to Aaron Haviland, closes: #448743
 
   [ Christian Perrier ]
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