Apply animation.scale to checkbox.android

[msageryd]

The checkbox animation speed on checkbox.android does not care about the new animation.scale theme setting.

To me it's annoyingly slow, so I would love if the animation scale were applied to it.

[Trancever]

@msageryd Can you submit a PR?

[msageryd]

Yes, that’s the right thing to do. I don’t have the time right now, so I posted the issue as a todo-post for myself or anyone else.