[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/localClass.kt

@@ -0,0 +1,26 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: JavaClass.java
+
+class JavaClass {
+    private Runnable r;
+
+    public JavaClass(Runnable r) {
+        this.r = r;
+    }
+
+    public void run() {
+        r.run();
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+var status: String = "fail"  // global property to avoid issues with accessing closure from local class (KT-4174)
+
+fun box(): String {
+    class C() : JavaClass({status = "OK"}) {}
+    C().run()
+    return status
+}