Fix default sidebar behavior (#92)

Author: stephenhowells

Diff for: app/Http/Middleware/HandleInertiaRequests.php

@@ -50,7 +50,7 @@ public function share(Request $request): array
                 ...(new Ziggy)->toArray(),
                 'location' => $request->url(),
             ],
-            'sidebarOpen' => $request->cookie('sidebar_state') === 'true',
+            'sidebarOpen' => ! $request->hasCookie('sidebar_state') || $request->cookie('sidebar_state') === 'true',
         ];
     }
 }