Minor fixes

- Not logging program name twice for wait errors
- Wait for tinyproxy to exit

cmd/gluetun/main.go

@@ -277,6 +277,7 @@ func _main(background context.Context, args []string) int {
 	<-serverDone
 	<-unboundDone
 	<-openvpnDone
+	<-tinyproxyDone
 	return exitStatus
 }