TF-3410 Fix wrong text style title in ComposerView

Signed-off-by: dab246 <tdvu@linagora.com>

lib/features/composer/presentation/styles/title_composer_widget_style.dart

@@ -1,10 +1,9 @@
 
+import 'package:core/presentation/utils/theme_utils.dart';
 import 'package:flutter/material.dart';
 
 class TitleComposerWidgetStyle {
-  static const TextStyle textStyle = TextStyle(
-    fontSize: 17,
-    fontWeight: FontWeight.w600,
+  static final TextStyle textStyle = ThemeUtils.textStyleHeadingHeadingSmall(
     color: Colors.black
   );
 }