chore: Follow up update snackbar

lib/utils/show_update_snackbar.dart

@@ -11,7 +11,6 @@ abstract class UpdateNotifier {
   static const String versionStoreKey = 'last_known_version';
 
   static void showUpdateSnackBar(BuildContext context) async {
-    final theme = Theme.of(context);
     final scaffoldMessenger = ScaffoldMessenger.of(context);
     final currentVersion = await PlatformInfos.getVersion();
     final store = await SharedPreferences.getInstance();
@@ -19,27 +18,11 @@ abstract class UpdateNotifier {
 
     if (currentVersion != storedVersion) {
       if (storedVersion != null) {
-        ScaffoldFeatureController? controller;
-        controller = scaffoldMessenger.showSnackBar(
+        scaffoldMessenger.showSnackBar(
           SnackBar(
             duration: const Duration(seconds: 30),
-            content: Row(
-              children: [
-                IconButton(
-                  icon: Icon(
-                    Icons.close_outlined,
-                    size: 20,
-                    color: theme.colorScheme.onPrimary,
-                  ),
-                  onPressed: () => controller?.close(),
-                ),
-                Expanded(
-                  child: Text(
-                    L10n.of(context).updateInstalled(currentVersion),
-                  ),
-                ),
-              ],
-            ),
+            showCloseIcon: true,
+            content: Text(L10n.of(context).updateInstalled(currentVersion)),
             action: SnackBarAction(
               label: L10n.of(context).changelog,
               onPressed: () => launchUrlString(AppConfig.changelogUrl),