Revert "Update expectations for 031-class-attributes."

This reverts commit 32580ebd54bfeef62d5769439d336ca33f5592b0.

The original commit tracked OpenJDK behaviour, which we've decided
to revert because several apps depend on the value of Package.toString.

bug: 28057303
diff --git a/test/031-class-attributes/expected.txt b/test/031-class-attributes/expected.txt
index 72656ae..de99872 100644
--- a/test/031-class-attributes/expected.txt
+++ b/test/031-class-attributes/expected.txt
@@ -84,7 +84,7 @@
   enclosingCon: null
   enclosingMeth: null
   modifiers: 1
-  package: package otherpackage, Unknown, version 0.0
+  package: package otherpackage
   declaredClasses: [0]
   member classes: [0]
   isAnnotation: false