http: Fix typo in request-parameters.

This is a follow-up of 2094d680.

* src/cuirass/http.scm (request-parameters): Fix typo.

src/cuirass/http.scm

@@ -156,7 +156,7 @@ Hydra format."
                                   ('nr (string->number param))
                                   (_   param)))
                           params)))
-                 (_ #f)))
+                 (_ params)))
               '()
               (string-split query #\&))
         '())))