only show relevant calendar sync options

lib/ui/mobile/settings/submenu/calendar_sync.dart

@@ -1,5 +1,7 @@
 // ignore_for_file: use_build_context_synchronously
 
+import 'dart:io';
+
 import 'package:refilc/api/providers/user_provider.dart';
 import 'package:refilc/models/linked_account.dart';
 import 'package:refilc/models/settings.dart';
@@ -196,6 +198,7 @@ class CalendarSyncScreenState extends State<CalendarSyncScreen>
                   if (thirdPartyProvider.linkedAccounts.isEmpty)
                     Column(
                       children: [
+                        if (Platform.isAndroid)
                           SplittedPanel(
                             title: Text('choose_account'.i18n),
                             padding: EdgeInsets.zero,
@@ -230,9 +233,10 @@ class CalendarSyncScreenState extends State<CalendarSyncScreen>
                               ),
                             ],
                           ),
-                        const SizedBox(
-                          height: 9.0,
-                        ),
+                        // const SizedBox(
+                        //   height: 9.0,
+                        // ),
+                        if (Platform.isIOS)
                           SplittedPanel(
                             padding: EdgeInsets.zero,
                             cardPadding: const EdgeInsets.all(4.0),