FIR2IR: Fix incorrect fake override structure for delegated member in supertype

In C, fake override for `name` should have B::name as base symbol, not Named::name

compiler/testData/compileKotlinAgainstKotlin/noExplicitOverrideForDelegatedFromSupertype.kt

@@ -0,0 +1,23 @@
+// TARGET_BACKEND: JVM
+// FILE: A.kt
+package a
+
+interface Named {
+    val name: String
+}
+
+interface A : Named
+
+// FILE: B.kt
+import a.*
+
+open class B(val a: A) : A by a, Named
+
+class C(a: A) : B(a)
+
+fun box(): String {
+    return C(object : A {
+        override val name: String
+            get() = "OK"
+    }).name
+}