refactor: remove unused router context from url helper

Author: jakobrosenberg

lib/runtime/helpers/index.js

@@ -100,7 +100,7 @@ export const goto = {
  */
 export const url = {
     subscribe: (run, invalidate) => {
-        const { fragment, router } = contexts
+        const { fragment } = contexts
 
         return derived(fragment.params, $params => {
             return (pathElemOrNode, params, options) => {