fix header in 404 page

src/components/Header.vue

@@ -42,7 +42,7 @@ export default {
     IconMember
   },
   mounted() {
-    this.$route.name === 'Login' ? this.showMember = false : this.showMember = true;
+    this.$route.name === 'Login' || this.$route.name === 'NotFound404' ? this.showMember = false : this.showMember = true;
   }
 }