Tests: fixed js_subrequests.t on win32.

Starting helper daemons before try_run() confuses perlfork emulation
and breaks STDERR redirection as done in try_run(), resulting
in error messages being printed.  Changed the order to fix things.
diff --git a/js_subrequests.t b/js_subrequests.t
index c05cd6f..c9bf9da 100644
--- a/js_subrequests.t
+++ b/js_subrequests.t
@@ -427,8 +427,8 @@
 
 $t->write_file('t', '["SEE-THIS"]');
 
-$t->run_daemon(\&http_daemon);
 $t->try_run('no njs available')->plan(23);
+$t->run_daemon(\&http_daemon);
 
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