Update live-tree.xml

[brianharvey]

Fix broken example project.

[jmoenig]

Nice! I love how you're mapping the angles to the mouse coordinates. I think the original project is not broken, it still works really well. The idea was to enable input sliders and the "execute on slider change" option, which then lets you interactively play with all the inputs, including the segment length and the recursion level of the tree.