Fixed Route::setUrl() behavior

When there are no parameters in the url, correctly empty the routes parameter array

tests/Pecee/SimpleRouter/Dummy/Route/DummyLoadableRoute.php

@@ -0,0 +1,11 @@
+<?php
+
+use Pecee\Http\Request;
+
+class DummyLoadableRoute extends Pecee\SimpleRouter\Route\LoadableRoute {
+
+    public function matchRoute(string $url, Request $request): bool
+    {
+        return false;
+    }
+}