[FakeOverrideBuilder] Fix referencing a local type from a return type

Copying tree part happens in two stages.
1. Collect all symbols to copy and create new version of them
2. Do copy tree, replacing collected symbols

For f/o builder 1-st stage traversed more nodes, than seconds.
This led to unbound symbols in tree.

^KT-65273 Fixed

compiler/testData/ir/irText/declarations/kt65273.kt

@@ -0,0 +1,10 @@
+// SEPARATE_SIGNATURE_DUMP_FOR_K2
+// ^ Different type of s - KT-65603
+
+class A {
+    private abstract class B {
+        val s = object {}
+    }
+
+    private class C : B()
+}