Start backlog at startup

[FlyingPersian]

Is your feature request related to a problem? Please describe.
As discussed in the following thread, I'd like for medusa to do a (forced) backlog search when booting up. My server doesn't run 24/7, so it won't download anything from the previous night until it runs a scheduled backlog.

#6919

Describe the solution you'd like
I'd like medusa to make sure all episodes from the previous night are set to wanted and then a backlog search is run.

Describe alternatives you've considered
Right now I've added "@reboot curl http://localhost:8081/manage/manageSearches/forceBacklog" to my crontab. I couldn't try it out yet because I don't have anything to download, but the log says that the backlog was started