osc: fix runtime enable_osc(true/false)

There were few issues:
- When it's disabled and then enabled, it was displaying the osc briefly and
  then autohide right away. Don't do that.
- When it's enabled and then disabled, it was not removing the osc from screen
  if called while the osc is visible (because tick() is responsible for the hide
  but it doesn't render() the empty osc when the osc is disabled).
- Due to delayed/async unbinding of mouse events it was possible to show_osc()
  after it got disabled e.g. from mouse_move. Prevent this.

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