Fixed WebGLRenderer updateGraphics bug

When using moveTo with the WEBGL renderer, a circle is drawn with the current lineStyle.

jsfiddle example: http://jsfiddle.net/theadam/kY9t9/

I tried to determine if this was a bug in the version of Pixi that is being used rather than in Phaser, but I couldn't figure out which version of Pixi the dev branch of Phaser is using. However, no tagged version of Pixi seems to have this problem.