Fix memory leak.
Fix memory leak.

Forgot to delete a thread after Join()ing it.

Herve-M/winsparkle,alamaison/winsparkle,CaptainJackJJ/SmpUpdater,CaptainJackJJ/SmpUpdater,drizt/winsparkle,dsuess/winsparkle,bristol-instruments/winsparkle,artillery/winsparkle,nickdademo/winsparkle,alamaison/winsparkle,drizt/winsparkle,bristol-instruments/winsparkle,artillery/winsparkle,Herve-M/winsparkle,nickdademo/winsparkle,dsuess/winsparkle