Fix route params.

tp-router.js

@@ -183,9 +183,13 @@ export class TpRouter extends LitElement {
       this.routes[namespace] = {};
     }
 
+    const keys = [];
+    const r = pathToRegexp(path, keys);
+    r.keys = keys;
+
     this.routes[namespace][path] = {
       path: path,
-      regex: pathToRegexp(path),
+      regex: r,
       data: data,
       redirect: redirect,
       params: {}