cleanup: Mark unused arguments as unused

This will stop eslint from warning about them, while keeping their
self-documenting benefit.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/627

js/ui/remoteSearch.js

@@ -310,7 +310,7 @@ var RemoteSearchProvider = class {
         this.proxy.ActivateResultRemote(id);
     }
 
-    launchSearch(terms) {
+    launchSearch(_terms) {
         // the provider is not compatible with the new version of the interface, launch
         // the app itself but warn so we can catch the error in logs
         log(`Search provider ${this.appInfo.get_id()} does not implement LaunchSearch`);