packages.pbs: Close new pipe to background process immediately.
packages.pbs: Close new pipe to background process immediately.

Otherwise it would be left open for at least the lifetime of the process
object, and garbage collection would trigger a ResourceWarning.

Also rename the “stdin” variables to be less confusing.

sbstp/streamlink,wlerin/streamlink,lyhiving/livestreamer,blxd/livestreamer,jtsymon/livestreamer,Feverqwe/livestreamer,Masaz-/livestreamer,blxd/livestreamer,breunigs/livestreamer,wolftankk/livestreamer,bastimeyer/streamlink,chrippa/livestreamer,chhe/streamlink,back-to/streamlink,gravyboat/streamlink,flijloku/livestreamer,mmetak/streamlink,chhe/livestreamer,chhe/streamlink,Saturn/livestreamer,gtmanfred/livestreamer,streamlink/streamlink,hmit/livestreamer,okaywit/livestreamer,intact/livestreamer,melmorabity/streamlink,Masaz-/livestreamer,derrod/livestreamer,mmetak/streamlink,Dobatymo/livestreamer,javiercantero/streamlink,Klaudit/livestreamer,programming086/livestreamer,lyhiving/livestreamer,derrod/livestreamer,sbstp/streamlink,gravyboat/streamlink,okaywit/livestreamer,charmander/livestreamer,caorong/livestreamer,bastimeyer/streamlink,asermax/livestreamer,streamlink/streamlink,Feverqwe/livestreamer,beardypig/streamlink,Klaudit/livestreamer,javiercantero/streamlink,hmit/livestreamer,back-to/streamlink,gtmanfred/livestreamer,jtsymon/livestreamer,caorong/livestreamer,melmorabity/streamlink,chrippa/livestreamer,flijloku/livestreamer,Saturn/livestreamer,Dobatymo/livestreamer,wlerin/streamlink,ethanhlc/streamlink,fishscene/streamlink,programming086/livestreamer,charmander/livestreamer,breunigs/livestreamer,fishscene/streamlink,intact/livestreamer,chhe/livestreamer,ethanhlc/streamlink,wolftankk/livestreamer,beardypig/streamlink