Mac OS app: menu icon doesn't follow the styling of the menu bar

In the Mac OS version, It would be nice if the menu bar icon followed the menu bar styling settings (dark or light mode).

Right now, there’s only a red icon which stands out more than necessary:


This is already possible in NW.js, see the official docs.

Not a bug report per se, just a nice aesthetic touch to have in the app. :slightly_smiling_face: