Update rasta direct expectations.

pkg/front_end/test/fasta/rasta/switch_execution_case_t02.dart.direct.expect

 library;
 import self as self;
 import "dart:core" as core;
 
 static method test(dynamic value) → dynamic {
   dynamic result;
   #L1:
   switch(value) {
     #L2:
     case 1:
       {
         result = 1;
         break #L1;
       }
     #L3:
     case 2:
       {
         result = 2;
         throw core::_fallThroughError();
       }
     #L4:
     case 3:
       {
         result = 3;
         throw core::_fallThroughError();
       }
     #L5:
     default:
-      result = 4;
+      {
+        result = 4;
+      }
   }
   return result;
 }
 static method testEmptyCases(dynamic value) → dynamic {
   dynamic result;
   #L6:
   switch(value) {
     #L7:
     case 1:
     case 2:
@@ skipping 10 matching lines @@
       }
     #L9:
     case 5:
     case 6:
     default:
       {}
   }
   return result;
 }
 static method main() → dynamic {}