[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/functions/referencesStaticInnerClassMethodL2.kt

@@ -0,0 +1,17 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: R.java
+
+class R {
+    public static class id {
+        public static class zzz {
+            public static final int main = 17;
+        }
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+fun box() =
+    if (R.id.zzz.main == 17) "OK" else "fail"