Close the WSS before the app quits.  Fixes #1173
Close the WSS before the app quits.  Fixes #1173

n4k1/Google-Play-Music-Desktop-Player-UNOFFICIAL-,MCManuelLP/Google-Play-Music-Desktop-Player-UNOFFICIAL-,petuhovskiy/Google-Play-Music-Desktop-Player-UNOFFICIAL-,MarshallOfSound/Google-Play-Music-Desktop-Player-UNOFFICIAL-,MarshallOfSound/Google-Play-Music-Desktop-Player-UNOFFICIAL-,petuhovskiy/Google-Play-Music-Desktop-Player-UNOFFICIAL-,n4k1/Google-Play-Music-Desktop-Player-UNOFFICIAL-,MCManuelLP/Google-Play-Music-Desktop-Player-UNOFFICIAL-,petuhovskiy/Google-Play-Music-Desktop-Player-UNOFFICIAL-,MarshallOfSound/Google-Play-Music-Desktop-Player-UNOFFICIAL-,n4k1/Google-Play-Music-Desktop-Player-UNOFFICIAL-,MCManuelLP/Google-Play-Music-Desktop-Player-UNOFFICIAL-