Use new icons

src/app/components/SpaceAuthError.svelte

@@ -2,6 +2,8 @@
   import {displayRelayUrl} from "@welshman/util"
   import {parse, renderAsHtml} from "@welshman/content"
   import Button from "@lib/components/Button.svelte"
+  import AltArrowLeft from "@assets/icons/alt-arrow-left.svg?dataurl"
+  import AltArrowRight from "@assets/icons/alt-arrow-right.svg?dataurl"
   import Icon from "@lib/components/Icon.svelte"
   import {preventDefault} from "@lib/html"
   import {ucFirst} from "@lib/util"
@@ -34,12 +36,12 @@
   </p>
   <ModalFooter>
     <Button class="btn btn-link" onclick={back}>
-      <Icon icon="alt-arrow-left" />
+      <Icon icon={AltArrowLeft} />
       Go back
     </Button>
     <Button type="submit" class="btn btn-primary">
       Request Access
-      <Icon icon="alt-arrow-right" />
+      <Icon icon={AltArrowRight} />
     </Button>
   </ModalFooter>
 </form>