Use new icons

src/app/components/InfoZapperError.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
   import {deriveZapperForPubkey} from "@welshman/app"
+  import AltArrowLeft from "@assets/icons/alt-arrow-left.svg?dataurl"
   import Icon from "@lib/components/Icon.svelte"
   import Button from "@lib/components/Button.svelte"
   import ModalHeader from "@lib/components/ModalHeader.svelte"
@@ -29,7 +30,7 @@
   </p>
   <ModalFooter>
     <Button class="btn btn-link" onclick={back}>
-      <Icon icon="alt-arrow-left" />
+      <Icon icon={AltArrowLeft} />
       Go back
     </Button>
   </ModalFooter>