Move blackBoxFile() testData to box/ directory

Delete all test methods (and empty test classes), since they'll be
auto-generated

compiler/testData/codegen/box/functions/kt1413.kt

@@ -0,0 +1,26 @@
+package t
+
+trait I{
+    fun f()
+}
+
+class Test{
+    fun foo(){
+        val i : I = object : I {
+            override fun f() {
+                fun local(){
+                    bar()
+                }
+                 local()
+            }
+        }
+        i.f()
+    }
+
+    fun bar(){}
+}
+
+fun box() : String {
+    Test().foo()
+    return "OK"
+}