Announcements should not be active by default

[TrainDoctor]

During our work testing announcements, we discovered that announcements were visible as they were being marked inactive and so to confirm they were working the store defaults to making announcements active.

Once SteamDeckHomebrew/Plugin-Store-Admin#1 is resolved plugin announcements should have whatever recommended default active/inactive status but should use the status given to them when an announcement is received from the announcements panel.

Edit: Plugin store also needa to expose a default expiration timeframe for announcements so that #73 in admin panel can be resolved announcement expiration timeframe.