FIX: Correct getOwner import (#260)

As it's currently implemented, the fallback is essential here. `this` in a static method is `undefined`, and therefore cannot have an owner.

Unfortunately this plugin outlet does not seem to be tested in the plugin's own test suite. Core's test suite picked up this issue.

Followup to 3a0b46d

assets/javascripts/discourse/connectors/bread-crumbs-right/solved-status-filter.js

@@ -1,5 +1,5 @@
 import I18n from "I18n";
-import { getOwner } from "@ember/application";
+import { getOwnerWithFallback } from "discourse-common/lib/get-owner";
 import Component from "@glimmer/component";
 import { action } from "@ember/object";
 import { inject as service } from "@ember/service";
@@ -17,7 +17,7 @@ const UX_VALUES = {
 
 export default class SolvedStatusFilter extends Component {
   static shouldRender(args, helper) {
-    const router = getOwner(this).lookup("service:router");
+    const router = getOwnerWithFallback(this).lookup("service:router");
 
     if (
       !helper.siteSettings.show_filter_by_solved_status ||