JS: move more test to box tests

js/js.translator/testData/box/simple/methodDeclarationAndCall.kt

@@ -0,0 +1,12 @@
+package foo
+
+class Test() {
+    fun method(): String {
+        return "OK"
+    }
+}
+
+fun box(): String {
+    var test = Test()
+    return test.method()
+}