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/switch/fallDownWithBlocks.kt

@@ -1,23 +1,21 @@
-public class C {
-    companion object {
-        public fun main(args: Array<String>) {
-            when (args.size()) {
-                1 -> {
-                    run {
-                        val a = 1
-                        System.out.print("1")
-                    }
-                    run {
-                        val a = 2
-                        System.out.print("2")
-                    }
+public object C {
+    public fun main(args: Array<String>) {
+        when (args.size()) {
+            1 -> {
+                run {
+                    val a = 1
+                    System.out.print("1")
                 }
-
-                2 -> {
+                run {
                     val a = 2
                     System.out.print("2")
                 }
             }
+
+            2 -> {
+                val a = 2
+                System.out.print("2")
+            }
         }
     }
 }