Remove generated black box java codegen test

Move all testData to boxWithJava/

compiler/testData/codegen/boxWithJava/protectedStatic/funNestedStaticClass.java

@@ -0,0 +1,7 @@
+public class funNestedStaticClass {
+    public static class Inner {
+        protected static String protectedFun() {
+            return "OK";
+        }
+    }
+}