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/issues/arrayLength.kt

@@ -1,7 +1,5 @@
-class Test {
-    companion object {
-        public fun foo(args: Array<String>): Int {
-            return args.size()
-        }
+object Test {
+    public fun foo(args: Array<String>): Int {
+        return args.size()
     }
 }