fix(marketplace): loosen type in categories component (#1918)

frontend/projects/marketplace/src/pages/list/categories/categories.component.ts

@@ -17,13 +17,13 @@ import {
 })
 export class CategoriesComponent {
   @Input()
-  categories!: Set<string>
+  categories: readonly string[] = []
 
   @Input()
-  category!: string
+  category = ''
 
   @Input()
-  updatesAvailable!: number
+  updatesAvailable = 0
 
   @Output()
   readonly categoryChange = new EventEmitter<string>()

frontend/projects/ui/src/app/pages/marketplace-routes/marketplace-list/marketplace-list.page.ts

@@ -23,7 +23,7 @@ export class MarketplaceListPage {
       info.categories.forEach(c => categories.add(c))
       categories.add('all')
 
-      return { categories, packages }
+      return { categories: Array.from(categories), packages }
     }),
   )