add ability to show backups to superadmins

app/Repos/System/Nova/NovaRepo.php

@@ -83,6 +83,14 @@ class NovaRepo
         return fn () => Gate::allows('isMe', auth()->user());
     }
 
+    /**
+     * Check if user is admin
+     */
+    public function isAdmin(): Closure
+    {
+        return fn () => Gate::allows('isAdmin', auth()->user());
+    }
+
     /**
      * Readonly only on "update" pages
      */