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/closureWithParameter.kt

@@ -0,0 +1,7 @@
+fun box() : String {
+    return apply( "OK", {(arg: String) -> arg } )
+}
+
+fun apply(arg : String, f :  (p:String) -> String) : String {
+    return f(arg)
+}