FIX: stop returning self as a candidate for related topics (#31)

lib/modules/embeddings/semantic_related.rb

@@ -34,6 +34,7 @@ module DiscourseAi
           .visible
           .listable_topics
           .secured
+          .where("id <> ?", topic.id)
           .where(id: candidate_ids)
           .order("array_position(ARRAY#{candidate_ids}, id)")
           .limit(SiteSetting.ai_embeddings_semantic_related_topics)

spec/lib/modules/embeddings/semantic_related_spec.rb

@@ -29,6 +29,7 @@ describe DiscourseAi::Embeddings::SemanticRelated do
       expect(results).to include(normal_topic_1)
       expect(results).to include(normal_topic_2)
       expect(results).to include(normal_topic_3)
+      expect(results).to_not include(target)
       expect(results).to_not include(unlisted_topic)
       expect(results).to_not include(private_topic)
       expect(results).to_not include(secured_category_topic)