macOS: Clicking on defguard client icon in dock should bring back the window

[teon]

When the window on macOS will be closed the only way to bring back the window is to click on the icon in tray.
But there are limits to tray icons, and some users do not see the tray icon.
Also it's a normal behavior - that clicking on the icon in the Docks should also bring back the window - which it doesn't.

Same should be on Windows/Linux (maybe is don't have the possibility to test).