Change nestedClasses logic to accept classes with nested type aliases

#KT-47650 fixed

compiler/testData/codegen/box/reflection/classes/nestedClassesInScript.kt

@@ -0,0 +1,22 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_FIR: JVM_IR
+// IGNORE_LIGHT_ANALYSIS
+// WITH_RUNTIME
+// WITH_REFLECT
+
+// FILE: test.kt
+
+fun box(): String {
+    val kClass = Script::class
+    val nestedClasses = kClass.nestedClasses
+    val nestedClass = nestedClasses.single()
+    return nestedClass.simpleName!!
+}
+
+
+// FILE: Script.kts
+
+class OK
+typealias Tazz = List<OK>
+val x: Tazz = listOf()
+x