Remove another ADTTMP appearance from test script

debian/tests/astrometry-test

@@ -25,6 +25,6 @@ for s in ρCen μVel βCha ηMus δVel μ2Cru; do
     grep -q "The star $s" ${test_dir}/${name}.log
 done
 
-if [ "$test_dir" != "$ADTTMP" ] ; then
+if [ "$test_dir" != "$AUTOPKGTEST_TMP" ] ; then
    rm -rf "$test_dir"
 fi