Generate private methods in TraitImpl as private, don't generate delegation to private trait methods

js/js.translator/src/org/jetbrains/kotlin/js/translate/declaration/ClassTranslator.kt

@@ -232,7 +232,7 @@ public class ClassTranslator private constructor(
     }
 
     private fun generateBridgesToTraitImpl(properties: MutableList<JsPropertyInitializer>) {
-        for (entry in CodegenUtil.getTraitMethods(descriptor).entrySet()) {
+        for (entry in CodegenUtil.getNonPrivateTraitMethods(descriptor).entrySet()) {
             if (!areNamesEqual(entry.getKey(), entry.getValue())) {
                 properties.add(generateDelegateCall(entry.getValue(), entry.getKey(), JsLiteral.THIS, context()))
             }