chore: Add missing trailing commas to encryption key modal page

lib/ui/pages/backups/copy_encryption_key_modal.dart

@@ -97,12 +97,14 @@ class _CopyEncryptionKeyModalState extends State<CopyEncryptionKeyModal> {
                                 ),
                           ),
                         ],
-                          )),
+                      ),
+                    ),
                   ),
                 ),
               ),
             ],
-            )),
+          ),
+        ),
         const SizedBox(height: 8),
         FilledButton.icon(
           onPressed: () {