JS: move more test to box tests

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

@@ -0,0 +1,25 @@
+package foo
+
+class A {
+
+}
+
+object test {
+    var c = 2;
+    var b = 1;
+}
+
+object aWrapper {
+    var a = A();
+}
+
+fun box(): String {
+    if (test.c != 2) return "fail1: ${test.c}"
+
+    if (test.b != 1) return "fail2: ${test.b}"
+    test.c += 10
+    if (test.c != 12) "fail3: ${test.c}"
+    if (aWrapper.a !is A) "fail4"
+
+    return "OK"
+}