title: Params only running the first time I click
body: <p>The params of my categories are only running the first click.</p>
  <p>I have this structure:</p>
  <p><a href="https://i.stack.imgur.com/ocYRZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ocYRZ.png" alt="enter image description here" /></a></p>
  <p>I have 2 categories: category/sell and category/rent</p>
  <p>sell and rent are the params</p>
  <p>When I click on a category it works.</p>
  <p>But it only runs on the first click, so when I click on the other category svelte doesn't rerender.</p>
  <p>My code [catName].svelte:</p>
  
  <pre class="lang-js prettyprint-override"><code>&lt;script&gt;
      import { page } from '$app/stores';
      const catName = $page.params.catName;
      // $: catName = $page.params.catName;
      $: listings = [];
  &lt;/script&gt;
  </code></pre>