Don't allow to use own nested classes when resolve header of (companion) object

compiler/testData/diagnostics/tests/scopes/classHeader/objectParents.kt

@@ -0,0 +1,11 @@
+interface I<F, G>
+
+val aImpl: A.Interface
+    get() = null!!
+
+object A : <!UNRESOLVED_REFERENCE!>Nested<!>(), <!UNRESOLVED_REFERENCE, DELEGATION_NOT_TO_INTERFACE!>Interface<!> by aImpl, I<<!UNRESOLVED_REFERENCE!>Nested<!>, <!UNRESOLVED_REFERENCE!>Interface<!>> {
+
+    class Nested
+
+    interface Interface
+}