emoji_reaction test [nfc]: Refactor helper default params

Author: chrisbobbe

test/widgets/emoji_reaction_test.dart

@@ -39,23 +39,23 @@ void main() {
 
  Future<void> setupChipsInBox(WidgetTester tester, {
  required List<Reaction> reactions,
- double? width,
- TextDirection? textDirection,
+ double width = 245.0, // (seen in context on an iPhone 13 Pro)
+ TextDirection textDirection = TextDirection.ltr,
  }) async {
  final message = eg.streamMessage(reactions: reactions);
 
  await tester.pumpWidget(
  MaterialApp(
  home: Directionality(
- textDirection: textDirection ?? TextDirection.ltr,
+ textDirection: textDirection,
  child: GlobalStoreWidget(
  child: PerAccountStoreWidget(
  accountId: eg.selfAccount.id,
  child: Center(
  child: ColoredBox(
  color: Colors.white,
  child: SizedBox(
- width: width ?? 245.0, // (seen in context on an iPhone 13 Pro)
+ width: width,
  child: ReactionChipsList(
  messageId: message.id,
  reactions: message.reactions!,