Everywhere: Use Core::ConfigFile::AllowWriting::Yes to allow writing

Author: https://github.com/networkException
Commit: 938051feb8
Pull-request: https://github.com/SerenityOS/serenity/pull/9501
Reviewed-by: https://github.com/awesomekling

Userland/Applications/Browser/DownloadWidget.cpp

@@ -90,7 +90,7 @@ DownloadWidget::DownloadWidget(const URL& url)
     m_close_on_finish_checkbox->set_checked(close_on_finish);
 
     m_close_on_finish_checkbox->on_checked = [&](bool checked) {
-        auto browser_config = Core::ConfigFile::get_for_app("Browser");
+        auto browser_config = Core::ConfigFile::get_for_app("Browser", Core::ConfigFile::AllowWriting::Yes);
         browser_config->write_bool_entry("Preferences", "CloseDownloadWidgetOnFinish", checked);
     };