[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/funGenericClass.kt

@@ -0,0 +1,22 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: J.java
+
+public class J<T> {
+    protected static String protectedFun() {
+        return "OK";
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+class Derived : J<String>() {
+    fun test(): String {
+        return J.protectedFun()!!
+    }
+}
+
+fun box(): String {
+    return Derived().test()
+}