[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/inheritedSimple.kt

@@ -0,0 +1,23 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: Sub.java
+
+class Super {
+    void safeInvoke(Runnable r) {
+        if (r != null) r.run();
+    }
+}
+
+class Sub extends Super {
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+fun box(): String {
+    var r = "FAIL"
+    val sub = Sub()
+    sub.safeInvoke(null)
+    sub.safeInvoke { r = "OK" }
+    return r
+}