Elements. Fix enum summary test logical merge conflict.

CL1: https://dart-review.googlesource.com/c/sdk/+/452846
CL2: https://dart-review.googlesource.com/c/sdk/+/452849

One changed printing `element2` with `element`.
Two printed `element2`.

Change-Id: I0c378e59a744d54bf603e8337ddfa2a0c7f39b51
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/453361
Reviewed-by: Paul Berry <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/test/src/summary/elements/enum_test.dart

@@ -200,7 +200,7 @@ library
                   constructorName: ConstructorName
                     type: NamedType
                       name: E @-1
-                      element2: <testLibrary>::@enum::E
+                      element: <testLibrary>::@enum::E
                       type: E
                     element: <testLibrary>::@enum::E::@constructor::new
                   argumentList: ArgumentList