Remove Truth Social-specific features

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

src/settings.ts

@@ -51,6 +51,3 @@ export const pushNotificationsSetting = new Settings('soapbox_push_notification_
 
 /** Remember hashtag usage. */
 export const tagHistory = new Settings('soapbox_tag_history');
-
-/** Remember group usage. */
-export const groupSearchHistory = new Settings('soapbox_group_search_history');