Fixed watch file using xz instead of gz

debian/watch

 version=3
 opts=pgpsigurlmangle=s/$/.asc/,\
-downloadurlmangle=s/\/(v?\d+\.\d+\.\d+.*)$/\/$1\/awit-dbackup-$1.tar.xz/,\
-filenamemangle=s/v?(\d+\.\d+\.\d+.*)$/awit-dbackup-$1.tar.xz/ \
+downloadurlmangle=s/\/(v?\d+\.\d+\.\d+.*)$/\/$1\/awit-dbackup-$1.tar.gz/,\
+filenamemangle=s/v?(\d+\.\d+\.\d+.*)$/awit-dbackup-$1.tar.gz/ \
 http://download.dbackup.org/v?(\d+\.\d+\.\d+.*)