git: openjdk/amber: sealed-types: fixing bug: enums were considered sealed even without enabling preview

[Vicente Romero]

Changeset: 418e7bda
Author:    Vicente Romero <vicente.romero at oracle.com>
Date:      2020-05-13 20:59:25 +0000
URL:       https://git.openjdk.java.net/amber/commit/418e7bda

fixing bug: enums were considered sealed even without enabling preview

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Check.java
! test/langtools/tools/javac/enum/FauxEnum3.java
! test/langtools/tools/javac/enum/FauxEnum3.out
+ test/langtools/tools/javac/enum/FauxEnum3.preview.out