fix: prevent category from being required

Author: joanagmaia

frontend/src/modules/admin/modules/collections/components/lf-collection-add.vue

@@ -187,9 +187,6 @@ const rules = {
   },
   description: { required: (value: string) => value.trim().length },
   projects: { required: (value: any) => value.length > 0 },
-  categoryId: {
-    required,
-  },
 };
 
 const $v = useVuelidate(rules, form);