content [nfc]: Give [Avatar] a required borderRadius param

Author: chrisbobbe

lib/widgets/content.dart

@@ -818,10 +818,12 @@ class Avatar extends StatelessWidget {
     super.key,
     required this.userId,
     required this.size,
+    required this.borderRadius,
   });
 
   final int userId;
   final double size;
+  final double borderRadius;
 
   @override
   Widget build(BuildContext context) {
@@ -839,7 +841,7 @@ class Avatar extends StatelessWidget {
     return SizedBox.square(
       dimension: size,
       child: ClipRRect(
-        borderRadius: const BorderRadius.all(Radius.circular(4)), // TODO vary with [size]?
+        borderRadius: BorderRadius.all(Radius.circular(borderRadius)),
         clipBehavior: Clip.antiAlias,
         child: avatar));
   }

lib/widgets/message_list.dart

@@ -486,7 +486,7 @@ class MessageWithSender extends StatelessWidget {
         child: Row(crossAxisAlignment: CrossAxisAlignment.start, children: [
           Padding(
             padding: const EdgeInsets.fromLTRB(3, 6, 11, 0),
-            child: Avatar(userId: message.senderId, size: 35)),
+            child: Avatar(userId: message.senderId, size: 35, borderRadius: 4)),
           Expanded(
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.stretch,