adding new configuration parameter 'forum_fold_categories' - refs #15317

Author: aragonc

main/install/configuration.dist.php

@@ -1110,3 +1110,6 @@
 // You need add a new option called "confirmation" to the registration settings
 //INSERT INTO settings_options (variable, value, display_text) VALUES ('allow_registration', 'confirmation', 'MailConfirmation');
 // ------ (End) Custom DB changes
+
+// Visually "fold" forum categories by default
+// $_configuration['forum_fold_categories'] = false;