Fix capturing of outer type parameters for classes declared inside init block

compiler/testData/codegen/box/regressions/kt24913.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+class Outer<T> (val v: T) {
+    val prop: Any?
+
+    init {
+        class Inner(val v: T) {
+            override fun toString() = v.toString()
+        }
+
+        val value: Inner = Inner(v)
+        prop = value
+    }
+}
+
+fun box(): String {
+    return Outer("OK").prop.toString()
+}