Minor editor rendering glitch

[angstr0m]

Thanks for this very nice behavior tree implementation!

I found a minor cosmetic issue, which doesn't seem to affect the functionality or usability:

When rendering behavior trees in the editor, the horizontal lines are a bit off:

fluid-behavior-tree version: 2.2.2 (included using the Unity package manager)
Unity: 2019.4.10f1 Personal
OS: macOS 10.15.6

[ashblue]

Debating on fixing this or just rewriting things with the new UI 🤔 Will try to fix first though for sure.

[ashblue]

If somebody wants to track this down and fix it, I bet it's a single line bugging out.

[ashblue]

Fixed by PR #97