[KT-4124] Fix some tests from common testData

compiler/testData/codegen/box/classes/kt504.kt

@@ -1,18 +1,17 @@
-// Enable for JS when it supports Java class library.
-// TARGET_BACKEND: JVM
-// BTW, this test does not seem relevant to real descsription of issue #KT-504
-import java.util.HashMap
-import java.io.*
+package mult_constructors_3_bug
 
-operator fun <K, V> MutableMap<K, V>.set(key : K, value : V) = put(key, value)
+public open class Identifier() {
+    private var myNullable : Boolean = true
+    companion object {
+        open public fun init(isNullable : Boolean) : Identifier {
+            val id = Identifier()
+            id.myNullable = isNullable
+            return id
+        }
+    }
+}
 
 fun box() : String {
-
-    val commands : MutableMap<String, String> = HashMap()
-
-    commands["c1"]  = "239"
-    if(commands["c1"] != "239") return "fail"
-
-    commands["c1"] += "932"
-    return if(commands["c1"] == "239932") "OK" else "fail"
+    Identifier.init(true)
+    return "OK"
 }