Remove annoying win32ui dialog box

If you close the win32ui, the win32ui is running with Administrative
privileges, everything to run the win32 agent is configured and the
Agent service is not running a dialog box will pop informing the user
the service is not running and ask them if they would like to start it.

This to me is an annoyance more than anything. It is likely the user
went into the win32ui to stop the service to begin with and knows it is
stopped.
Merge pull request #96 from awiddersheim/fix_win32_ui_dumb_dialog

Remove annoying win32ui dialog box