Move blackBoxFile() testData to box/ directory

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

compiler/testData/codegen/box/closures/closureWithParameterAndBoxing.kt

@@ -0,0 +1,7 @@
+fun box() : String {
+    return if (apply( 5, {(arg: Int) -> arg + 13 } ) == 18) "OK" else "fail"
+}
+
+fun apply(arg : Int, f :  (p:Int) -> Int) : Int {
+    return f(arg)
+}