app/internal/wm: [macOS] make app emnu responsive on launch

The macOS app menu would respond to clicks, only to shotcuts (Cmd-Q,
Cmd-H). Moving setActivationPolicy to applicationDidFinishLaunching
seems to fix that, although I can't explain why.

Move a SetDriver call after initialization while here.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/wm/os_macos.go

@@ -395,9 +395,9 @@ func NewWindow(win Callbacks, opts *Options) error {
 			return
 		}
 		errch <- nil
-		win.SetDriver(w)
 		w.w = win
 		w.window = C.gio_createWindow(w.view, nil, 0, 0, 0, 0, 0, 0)
+		win.SetDriver(w)
 		w.Option(opts)
 		if nextTopLeft.x == 0 && nextTopLeft.y == 0 {
 			// cascadeTopLeftFromPoint treats (0, 0) as a no-op,