msglist [nfc]: whitespace nits around widget constructors and member fields

Author: sirpengi

lib/widgets/message_list.dart

@@ -110,7 +110,6 @@ class MessageList extends StatefulWidget {
 class _MessageListState extends State<MessageList> {
   MessageListView? model;
   final ScrollController scrollController = ScrollController();
-
   final ValueNotifier<bool> _scrollToBottomVisibleValue = ValueNotifier<bool>(false);
 
   @override
@@ -235,6 +234,7 @@ class _MessageListState extends State<MessageList> {
 
 class ScrollToBottomButton extends StatelessWidget {
   const ScrollToBottomButton({super.key, required this.scrollController, required this.visibleValue});
+
   final ValueNotifier<bool> visibleValue;
   final ScrollController scrollController;