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/methodCallExpression/vararg1.kt

@@ -1,11 +1,9 @@
 import java.lang.reflect.Constructor
 
-class X {
-    companion object {
-        throws(javaClass<Exception>())
-        fun <T> foo(constructor: Constructor<T>, args1: Array<Any>, args2: Array<Any>) {
-            constructor.newInstance(*args1)
-            constructor.newInstance(args1, args2)
-        }
+object X {
+    throws(javaClass<Exception>())
+    fun <T> foo(constructor: Constructor<T>, args1: Array<Any>, args2: Array<Any>) {
+        constructor.newInstance(*args1)
+        constructor.newInstance(args1, args2)
     }
 }