chore(server): remove unused code (#9746)

server/src/queries/memory.repository.sql

@@ -9,6 +9,12 @@ WHERE
   "memories_assets"."memoriesId" = $1
   AND "memories_assets"."assetsId" IN ($2)
 
+-- MemoryRepository.addAssetIds
+INSERT INTO
+  "memories_assets_assets" ("memoriesId", "assetsId")
+VALUES
+  ($1, $2)
+
 -- MemoryRepository.removeAssetIds
 DELETE FROM "memories_assets_assets"
 WHERE