Fix passing non-string value to print/println in node.js

See KT-15484

js/js.translator/testData/box/native/print.js

@@ -3,7 +3,7 @@ var buffer = "";
 function writeToBuffer(a) {
     var type = typeof a;
     if (type === "undefined") return;
-    if (type !== "string") throw Error("Expected string argument type, but got: " + type);
+    if (type !== "string" && !(a instanceof String)) throw Error("Expected string argument type, but got: " + type);
 
     buffer += a;
 }
@@ -16,7 +16,12 @@ function writelnToBuffer(a) {
 var GLOBAL = (0, eval)("this");
 
 GLOBAL.console = {
-    log: writelnToBuffer
+    log: function (a) {
+        if (typeof a !== "undefined") {
+            buffer += a
+        }
+        buffer += "\n";
+    }
 };
 
 GLOBAL.outputStream =  {