FIX: Search does not retrigger when context has changed.

https://meta.discourse.org/t/using-the-search-this-topic-check-box-blocks-search-on-other-pages/56832/6?u=tgxworld

app/assets/javascripts/discourse/widgets/search-menu.js.es6

@@ -196,6 +196,8 @@ export default createWidget("search-menu", {
       this.triggerSearch();
     }
 
+    searchData.contextEnabled = attrs.contextEnabled;
+
     return this.attach("menu-panel", {
       maxWidth: 500,
       contents: () => this.panelContents()