msglist [nfc]: Inline time string

Author: sirpengi

lib/widgets/message_list.dart

@@ -849,8 +849,6 @@ class MessageWithPossibleSender extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final message = item.message;
-    final time = _kMessageTimestampFormat
-      .format(DateTime.fromMillisecondsSinceEpoch(1000 * message.timestamp));
 
     final senderRow = item.showSender
       ? Padding(
@@ -898,7 +896,9 @@ class MessageWithPossibleSender extends StatelessWidget {
             width: 80,
             padding: const EdgeInsets.only(top: 4, right: 16 - 8),
             alignment: Alignment.topRight,
-            child: Text(time,
+            child: Text(
+              _kMessageTimestampFormat.format(
+                DateTime.fromMillisecondsSinceEpoch(1000 * message.timestamp)),
               style: TextStyle(
                 color: _kMessageTimestampColor,
                 fontFamily: 'Source Sans 3',