JS: move more test to box tests

js/js.translator/testData/box/objectDeclaration/objectInheritingFromClass.kt

@@ -0,0 +1,9 @@
+package foo
+
+abstract class A(val s: String) {
+}
+
+object B : A("test") {
+}
+
+fun box() = if (B.s == "test") "OK" else "fail: ${B.s}"