Don't generate delegation to java default methods

#KT-15226  Fixed

compiler/testData/codegen/java8/box/delegationBy/inClassDeclaration.kt

@@ -0,0 +1,22 @@
+// FILE: Base.java
+
+public interface Base {
+    String getValue();
+
+    default String test() {
+        return getValue();
+    }
+}
+
+// FILE: main.kt
+class Fail : Base {
+    override fun getValue() = "Fail"
+}
+
+class Derived : Base by Fail() {
+    override fun getValue() = "OK"
+}
+
+fun box(): String {
+    return Derived().test()
+}