[LC] Fix invalid nullability for properties

Fixed #KT-46097 and #KT-41671

compiler/testData/asJava/ultraLightClasses/constructors.kt

@@ -1,4 +1,3 @@
-
 class TestConstructor private constructor(p: Int = 1)
 class A(vararg a: Int, f: () -> Unit) {}
 
@@ -15,3 +14,7 @@ class Outer {
 sealed class A(val x: String? = null) {
     class C : A()
 }
+
+class ClassWithPrivateCtor private constructor(
+    public val property: Set<Int>
+)