UX: check category permission before new topic quote (#30753)

Reported here:
https://meta.discourse.org/t/quoting-a-closed-topic-prefills-category-in-composer-that-should-be-off-limits/260009

Currently, if someone tries to quote a topic they don't have permission
to reply to, we'll open a new topic composer with the quote so they can
"continue the discussion". When doing this, we populate the current
category, even if the user doesn't have permission to post in it.

This is misleading, as when the user attempts to submit their topic they
get an error because they lack the category permissions.

This change checks the category permissions before populating it.

app/assets/javascripts/discourse/app/controllers/topic.js

@@ -1201,7 +1201,9 @@ export default class TopicController extends Controller.extend(
       options = {
         action: Composer.CREATE_TOPIC,
         draftKey: post.topic.draft_key,
-        topicCategoryId: this.get("model.category.id"),
+        topicCategoryId:
+          this.get("model.category.permission") &&
+          this.get("model.category.id"),
         prioritizedCategoryId: this.get("model.category.id"),
       };
     }