cancel subscriptions on signup popup destroy

src/app/website/signup/TeamPopup.svelte

@@ -1,14 +1,17 @@
 <script lang="ts">
   import { teamPopupOpen, teamPopupName } from '@app/website/signup/TeamPopup.ts';
   import Input from '@components/input/Input.svelte';
+  import { onDestroy } from 'svelte';
 
   let modal: HTMLDialogElement;
   let form: HTMLFormElement;
 
-  teamPopupOpen.subscribe((value) => {
+  const cancel = teamPopupOpen.subscribe((value) => {
     if (value) modal.show();
     else form?.reset();
   });
+
+  onDestroy(cancel);
 </script>
 
 <dialog class="modal" bind:this={modal} onclose={() => ($teamPopupOpen = false)}>