[issue #2369] [reproduction-test] inner types not detected as static if in interface/enum.

test/transform/resource/after-ecj/WithNested.java

@@ -0,0 +1,12 @@
+public interface WithNested<Z> {
+  @lombok.RequiredArgsConstructor class IAmStaticReally {
+    final @lombok.With String x;
+    public @java.lang.SuppressWarnings("all") WithNested.IAmStaticReally withX(final String x) {
+      return ((this.x == x) ? this : new WithNested.IAmStaticReally(x));
+    }
+    public @java.lang.SuppressWarnings("all") IAmStaticReally(final String x) {
+      super();
+      this.x = x;
+    }
+  }
+}