LibGUI: Give recent-file actions a nicer status tip

"Open /path/to/file" instead of just "/path/to/file".

Userland/Libraries/LibGUI/Application.cpp

@@ -360,6 +360,7 @@ void Application::update_recent_file_actions()
             action->set_visible(true);
             action->set_enabled(true);
             action->set_text(path);
+            action->set_status_tip(String::formatted("Open {}", path).release_value_but_fixme_should_propagate_errors());
             ++number_of_recently_open_files;
         }
     };