[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/property/referenceToJavaFieldViaBridge.kt

@@ -0,0 +1,24 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: test/D.java
+
+package test;
+
+public class D {
+    protected String field = "OK";
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+import test.D
+
+class A : D() {
+    fun a(): String {
+        return {field!!}()
+    }
+}
+
+fun box(): String {
+    return A().a()
+}