Do not suggest "convert to object" for sealed sub-classes with state

So #KT-24816 Fixed

idea/testData/inspectionsLocal/convertSealedSubClassToObject/baseState.kt

@@ -0,0 +1,7 @@
+// PROBLEM: none
+
+abstract class Base(var x: String)
+
+sealed class Sealed(s: String) : Base(s)
+
+<caret>class Derived : Sealed("123")