d/postinst: version-guard migration to new pending pmg-score location

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/postinst

@@ -126,6 +126,7 @@ case "$1" in
             fi
         fi
 
+        if test -n "$2" && dpkg --compare-versions "$2" 'lt' '8.2.0'; then
             old_score_location=/var/cache/pmg-scores.cf
             new_score_location=/etc/mail/spamassassin/pmg-scores.cf.new
             if test -e "$old_score_location"; then
@@ -136,6 +137,7 @@ case "$1" in
                     echo "both $old_score_location and $new_score_location exist - please review manually"
                 fi
             fi
+        fi
     ;;
 
     abort-upgrade)