Tray icon on Windows requires triple click

[ngcg]

Instead of double-click, it toggles the window with a triple click.
The code in tray.js doesn't use on('double-clicked') on win32 for some reason, but the OS (Win 7 and 10 at least) does send the second click as a double-click event, so only the third click finally works with the 'clicked' handler.

[rodrigok]

Closed via #116