Fix typo in debug pipe name

ffoo/saturnin_www.sh

@@ -13,7 +13,7 @@ filter_exprs() {
             next unless m/\b([a-zA-Z]{2,}\s*=\s*\d+)\b/;
             print "$1\n";
         ' \
-      | debug_pipe id_lookalikes
+      | debug_pipe ex_lookalikes
 }