ui/app: take input focus when initializing the HTML canvas element

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

ui/app/os_js.go

@@ -56,6 +56,7 @@ func createWindow(opts *WindowOptions) error {
 	w.w = newWindow(w)
 	go func() {
 		windows <- w.w
+		w.focus()
 		w.w.event(ChangeStage{StageRunning})
 		w.draw(true)
 		select {}