[Test] Properly merge box against java testdata into codegen/box

Previous commit about it was 3199ce03 and it was completely wrong

compiler/testData/codegen/box/sam/adapters/comparator.kt

@@ -0,0 +1,23 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: JavaClass.java
+
+import java.util.*;
+
+class JavaClass {
+    public static void sortIntList(List<Integer> list, Comparator<Integer> comparator) {
+        Collections.sort(list, comparator);
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+import java.util.*
+
+fun box(): String {
+    val list = ArrayList(Arrays.asList(3, 2, 4, 8, 1, 5))
+    val expected = ArrayList(Arrays.asList(8, 5, 4, 3, 2, 1))
+    JavaClass.sortIntList(list, { a, b -> b - a })
+    return if (list == expected) "OK" else list.toString()
+}