chore: Follow up fix ios share files

lib/pages/image_viewer/image_viewer_view.dart

@@ -32,13 +32,13 @@ class ImageViewerView extends StatelessWidget {
             color: Colors.white,
             tooltip: L10n.of(context)!.share,
           ),
+          if (PlatformInfos.isAndroid)
             IconButton(
               icon: const Icon(Icons.download_outlined),
               onPressed: controller.saveFileAction,
               color: Colors.white,
               tooltip: L10n.of(context)!.downloadFile,
             ),
-          if (PlatformInfos.isAndroid)
           IconButton(
             onPressed: controller.shareFileAction,
             tooltip: L10n.of(context)!.share,

lib/utils/matrix_sdk_extensions.dart/matrix_file_extension.dart

@@ -12,6 +12,9 @@ import 'package:fluffychat/utils/platform_infos.dart';
 
 extension MatrixFileExtension on MatrixFile {
   void save(BuildContext context) async {
+    if (PlatformInfos.isIOS) {
+      return share(context);
+    }
     final fileName = name.split('/').last;
 
     final file = FilePickerCross(bytes);