* Fix window.layer.focusTraversalKeysEnabled = false

Disabling focus keys didn't work

Test:
```
    window.layer.focusTraversalKeysEnabled = false
    window.layer.addKeyListener(object : KeyAdapter() {
        override fun keyPressed(event: KeyEvent) {
            println("keyPressed")
        }
    })
```

Press Tab or Shift-Tab. Before fix there was no output in console

* Remove unused import