Fixes #3363. Fix part of directive in scope_A06_t03_part1.dart (#3364)

Author: sgrekhov

LanguageFeatures/Parts-with-imports/scope_A06_t03_part1.dart

@@ -25,7 +25,7 @@
 
 // SharedOptions=--enable-experiment=enhanced-parts
 
-part of 'scope_A06_t02.dart';
+part of 'scope_A06_t03.dart';
 
 import 'parts_lib.dart' as l;