adapt circle diameter to position of isets

The information sets are correct only for default settings of the circles, otherwise misaligned.
The picture shows this for circle size 30. Use updated values. Probably similar to https://github.com/gambitproject/jsgte/pull/72

![isetswrong](https://cloud.githubusercontent.com/assets/798638/14060375/b30a2330-f35a-11e5-8482-d5967edbbad8.png)
