DEV: Remove depreciation warning in `user-topics-lists` controller.

DEV: Remove depreciation warning in user-topics-lists controller.

The <(unknown):ember849>#canBulkSelect computed property was just overriden. This removes the computed property and replaces it with a plain value, and has been deprecated.

Follow-up to 43058db3cae5f9a06e62204253a8be0404948425

diff --git a/app/assets/javascripts/discourse/app/routes/build-private-messages-route.js b/app/assets/javascripts/discourse/app/routes/build-private-messages-route.js
index caec153..b62178e 100644
--- a/app/assets/javascripts/discourse/app/routes/build-private-messages-route.js
+++ b/app/assets/javascripts/discourse/app/routes/build-private-messages-route.js
@@ -41,7 +41,6 @@ export default (viewName, path, channel) => {
       this.controllerFor("user-topics-list").setProperties({
         hideCategory: true,
         showPosters: true,
-        canBulkSelect: true,
         tagsForUser: this.modelFor("user").get("username_lower"),
         selected: [],
         showToggleBulkSelect: true,

GitHub sha: 0ce9fd12d09ca06262d67626899b62ca290b5166

This commit appears in #13820 which was approved by CvX. It was merged by tgxworld.