JS: move more test to box tests

js/js.translator/testData/box/propertyAccess/initInstanceProperties.kt

@@ -0,0 +1,16 @@
+package foo
+
+class Test() {
+    val a: Int = 100
+    var b: Int = a
+    val c: Int = a + b
+}
+
+fun box(): String {
+    val test = Test()
+    if (100 != test.a) return "fail1: ${test.a}"
+    if (100 != test.b) return "fail2: ${test.b}"
+    if (200 != test.c) return "fail3: ${test.c}"
+
+    return "OK"
+}