Oval tool filling pixels incorrectly for oblong shapes

[Cody811]

The oval shape is filling incorrect pixels along the X axis

X=2 Y=1

X=5, Y=1

X=6, Y=3

Y=3. X=6

[theabbie]

@Cody811 Might be an issue in algorithm, we will fix it, Thanks.

https://github.com/rgab1508/PixelCraft/blob/cf69d934483dbd06e8b4e7b8dd7190823fb8f9f1/lib/Shapes.js#L134