Fix broken isEnumClassObject methods

Out of three methods, two were incorrect

compiler/testData/loadJava/compiledJava/static/Enum.java

@@ -7,9 +7,11 @@ public enum Enum {
 
     public static class Nested {
         void foo() {}
+        void values() {}
     }
 
     public class Inner {
         void bar() {}
+        void valueOf(String s) {}
     }
 }