msglist [nfc]: Make _SenderRow accept MessageBase

[chris: removed unused import]

Co-authored-by: Chris Bobbe <[email protected]>

Author: PIG208

lib/widgets/message_list.dart

@@ -1416,7 +1416,7 @@ final _kMessageTimestampFormat = DateFormat('h:mm aa', 'en_US');
 class _SenderRow extends StatelessWidget {
   const _SenderRow({required this.message, required this.showTimestamp});
 
-  final Message message;
+  final MessageBase message;
   final bool showTimestamp;
 
   @override
@@ -1446,7 +1446,9 @@ class _SenderRow extends StatelessWidget {
                     userId: message.senderId),
                   const SizedBox(width: 8),
                   Flexible(
-                    child: Text(store.senderDisplayName(message),
+                    child: Text(message is Message
+                        ? store.senderDisplayName(message as Message)
+                        : store.userDisplayName(message.senderId),
                       style: TextStyle(
                         fontSize: 18,
                         height: (22 / 18),