[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/visibility/protectedStatic/simpleProperty.kt

@@ -0,0 +1,20 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: Base.java
+
+public class Base {
+    protected static final String protectedProperty = "OK";
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+class Derived : Base() {
+    fun test(): String {
+        return Base.protectedProperty!!
+    }
+}
+
+fun box(): String {
+    return Derived().test()
+}