Variable Scope looks wrong

[karianpour]

https://github.com/romkor/svelte-portal/blob/bddbc7c6d95c84b073b05319646ee25cdec3e5a5/src/Portal.svelte#L11C9-L11C17

I guess that "targetEl" variable can be defined inside the "update" function as follow:

  export function portal(el, target = "body") {
-    let targetEl;
    async function update(newTarget) {
-      target = newTarget;
+    let targetEl;
      if (typeof target === "string") {