JS: move more test to box tests

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

@@ -0,0 +1,14 @@
+package foo
+
+fun f(a: Int?, b: Int.(Int) -> Int) = a?.b(2)
+
+fun box(): String {
+    val c1 = f (null) {
+        it + this
+    } != null
+    if (c1) return "fail1"
+    if (f(3) {
+        it + this
+    } != 5) return "fail2"
+    return "OK"
+}