chore: Fix download on web

lib/pages/image_viewer/image_viewer_view.dart

@@ -32,13 +32,14 @@ class ImageViewerView extends StatelessWidget {
             color: Colors.white,
             tooltip: L10n.of(context)!.share,
           ),
-          if (PlatformInfos.isAndroid)
+          if (!PlatformInfos.isIOS)
             IconButton(
               icon: const Icon(Icons.download_outlined),
               onPressed: controller.saveFileAction,
               color: Colors.white,
               tooltip: L10n.of(context)!.downloadFile,
             ),
+          if (PlatformInfos.isMobile)
             IconButton(
               onPressed: controller.shareFileAction,
               tooltip: L10n.of(context)!.share,