Fix invocation of osh2oil in the wild tests.

osh -n --fix prints the AST too.  (TODO: disallow that combo?)

test/wild-runner.sh

@@ -42,7 +42,7 @@ process-file() {
  out_file=${www_base}__oil.txt

  run-task-with-status $task_file \
    $OSH -n --fix $abs_path \
    $OSH --fix $abs_path \
    > $out_file 2> $stderr_file
}