catalog-backend: fix relations compat flag not being applied

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/catalog-backend/src/service/createRouter.ts

@@ -216,7 +216,7 @@ export async function createRouter(
               signal.throwIfAborted();
 
               if (!disableRelationsCompatibility) {
-                processEntitiesResponseItems(
+                result.items = processEntitiesResponseItems(
                   result.items,
                   expandLegacyCompoundRelationsInEntity,
                 );

plugins/catalog-backend/src/service/response/process.ts

@@ -39,7 +39,7 @@ export function processRawEntitiesResult(
 export function processEntitiesResponseItems(
   response: EntitiesResponseItems,
   transform?: (entity: Entity) => Entity,
-) {
+): EntitiesResponseItems {
   if (!transform) {
     return response;
   }