conf: set SkipLaunch to true during context initialization

this prevents starting openvpn connection automatically after
app start, since currently there's no preference setting  for
it to allow the user to control the behavior

this also sets DisableAutostart to true since it is currently
not working on any of the platforms

gui/backend.go

@@ -92,6 +92,8 @@ func InitializeBitmaskContext(provider string,
 	opts.Obfs4 = obfs4
 	opts.DisableAutostart = disableAutostart
 	opts.StartVPN = startVPN
+	opts.DisableAutostart = true
+	opts.SkipLaunch = true
 	go backend.InitializeBitmaskContext(opts)
 }