Tests: adapting unsafe redirect test for QuickJS.

At the moment QuickJS has no API for getting strings
with NUL characters in the middle of the string.

Instead of a NUL byte make another unsafe redirect URI.

nginx/t/js_internal_redirect.t

@@ -72,7 +72,7 @@ $t->write_file('test.js', <<EOF);
             r.internalRedirect('\@named');
 
         } else if (r.variables.arg_unsafe) {
-            r.internalRedirect('/red\0rect');
+            r.internalRedirect('/red/../rect');
 
         } else if (r.variables.arg_quoted) {
             r.internalRedirect('/red%69rect');