Fix dispatch parameter in AdventureCard.svelte and add Save as File button in +page.svelte

src/lib/components/AdventureCard.svelte

@@ -8,7 +8,7 @@
     export let id:Number;
 
     function remove() {
-        dispatch('remove', name);
+        dispatch('remove', id);
     }
     function edit() {
         dispatch('edit', id)

src/routes/+page.svelte

@@ -89,7 +89,9 @@
     </form>
 {/if}
 
+{#if adventures.length != 0}
 <button on:click={async () => { window.location.href = exportData(); }}>Save as File</button>
+{/if}
 
 <style>
 .addsomething {