KT-5287 J2K: Convert class with private constructor and static functions to "object" instead of class with "class object"

#KT-5287 Fixed

j2k/testData/fileOrElement/class/notUtilityClass.kt

@@ -0,0 +1,10 @@
+open class Base {
+    companion object {
+        public val CONSTANT: Int = 10
+    }
+}
+
+class Derived : Base() {
+    fun foo() {
+    }
+}