bugfix for joystick plugin

[Stephan]

Hi,

 

I would like to add to propose the following small update to the joystick plugin in order to make it compatible with hires scaling:

 

var radius = this.bg.shapes[0].shape.radius / 2;

must become:

var radius = this.bg.shapes[0].shape.radius / 2 / game.scale;

could you update this  @enpu?

 

Thanks!