Revert "K2/Java: add private enum constructor for MPP matching"

Review: https://jetbrains.team/p/kt/reviews/13368/timeline

This reverts commit 2cea2b9098.

Motivation:
KT-62961 was fixed independently by two different commits:
- ac3d8ad3ac
- 2cea2b9098

If possible, it's better not to introduce implicit declarations.
That's why it was agreed to keep
ac3d8ad3ac and revert
2cea2b9098

compiler/testData/loadJava/compiledJava/annotations/NestedEnumInAnnotation.fir.txt

@@ -13,8 +13,6 @@ public final annotation class Api : R|kotlin/Annotation| {
         public final static val entries: R|kotlin/enums/EnumEntries<test/Api.Status>|
             public get(): R|kotlin/enums/EnumEntries<test/Api.Status>|
 
-        private constructor(): R|test/Api.Status|
-
     }
 }
 @R|test/Api|(status = R|test/Api.Status.Ok|) public open class NestedEnumInAnnotation : R|kotlin/Any| {