Avoid svlete error from condition slot.

Error outlined here sveltejs/svelte#3165, and
there is no fix, so I just avoided having a conditional slot, and just
rerouted to an installMetaMask page instead.

src/routes/__layout.svelte

@@ -1,20 +1,19 @@
 <script lang="ts">
+    import { goto } from "$app/navigation";
     import { onMount } from "svelte";
-    console.log("in layout")
-    let mounted;
-    let metamaskInstalled;
-    onMount(async ()=>{
-        if (typeof window.ethereum !== 'undefined' && window.ethereum.isMetaMask) {
-            metamaskInstalled = true
+    import { page } from '$app/stores';
+
+    let path;
+    page.subscribe((pg) => {
+        path = pg.path
+    })
+    onMount(()=>{
+        const installMetaMask = "/installMetaMask"
+        if ((typeof window.ethereum === 'undefined' || !window.ethereum.isMetaMask) && path !== installMetaMask) {
+            console.log(path, installMetaMask, path !== installMetaMask)
+            goto(installMetaMask)
         }
-        mounted = true
     })
 </script>
 
-{#if mounted}
-    {#if metamaskInstalled}
-        <slot></slot>
-    {:else}
-        <a href="https://metamask.io/">Install MetaMask</a>
-    {/if}
-{/if}
+<slot></slot>

src/routes/installMetaMask.svelte

@@ -0,0 +1 @@
+<a href="https://metamask.io/">Install MetaMask</a>