Remove implementation specific access to _ from test

Operator `new` is already tested with String class

js/js.translator/testData/box/jsCode/operators.kt

@@ -1,8 +1,5 @@
 // EXPECTED_REACHABLE_NODES: 1290
 
-@JsExport
-data class A(val value: Int)
-
 fun box(): String {
     assertEquals(-1, js("-1"), "- (unary)")
     assertEquals(1, js("+'1'"), "+ (unary)")
@@ -62,7 +59,6 @@ fun box(): String {
     assertEquals(undefined, js("(void 0)"), "void")
     assertEquals(true, js("'key' in {'key': 10}"), "in")
     assertEquals("string", js("typeof 'str'"), "typeof")
-    assertEquals(A(2), js("new _.A(2)"), "new")
     assertEquals(true, js("new String('str') instanceof String"), "instanceof")
 
     var s: Any = js("({key: 10})")