Always print class id in proto comparison test

A name of class file was used for added and removed classes
before the change.
The change is required for reusing the test data in js proto comparison
tests (there is no classfiles in js, so it is hard to
emulate jvm classfiles names for inner/nested classes).

jps-plugin/testData/comparison/classMembersOnlyChanged/sealedClassImplAdded/result.out

@@ -1,5 +1,5 @@
-ADDED: class Base$C.class
-changes in test/Base.A: NONE
-changes in test/Base.B: NONE
+ADDED: class test/Base.C
 changes in test/Base: CLASS_SIGNATURE, MEMBERS
     [C]
+changes in test/Base.A: NONE
+changes in test/Base.B: NONE