fix: make CollectionRequest.showAggregateTabs optional (CM-1193)

collection.page.vue's featured-star toggle builds a CollectionRequest
object literal that omits showAggregateTabs (and other optional fields),
relying on the backend to preserve omitted values on partial update.
The field was typed as required, which breaks that existing call site.

Signed-off-by: Gašper Grom <gasper.grom@gmail.com>

Author: gaspergrom

frontend/src/modules/admin/modules/collections/models/collection.model.ts

@@ -26,7 +26,7 @@ export interface CollectionRequest {
   color?: string;
   slug: string;
   starred: boolean;
-  showAggregateTabs: boolean;
+  showAggregateTabs?: boolean;
   projects: {
     id: string;
     starred: boolean;