fix(consumer): chat decls use repo as pkey not at_uri

consumer/src/indexer/mod.rs

···
         }
         CollectionType::BskyVerification => db::verification_delete(conn, at_uri).await?,
         CollectionType::BskyLabelerService => db::labeler_delete(conn, at_uri).await?,
-        CollectionType::ChatActorDecl => db::chat_decl_delete(conn, at_uri).await?,
+        CollectionType::ChatActorDecl => db::chat_decl_delete(conn, repo).await?,
         _ => unreachable!(),
     };