Fix penalty box arc

[Torvaney]

The current method of plotting a whole circle behind the penalty box means that on small/distorted pitch shapes, the circle can peek out from behind the goal:

As part of the same issue, the circles change size (relative to the rest of the pitch) depending on the size/aspect ratio of the pitch. This should be avoided if possible.

Perhaps there's a clean solution using annotate?

[Torvaney]

Alternatively, we could continue to use annotation_custom but change the grob to use grid::grid.path

[Torvaney]

Or could add a viewport (arg to circleGrob) to clip the circle -> semi-circle

[Torvaney]

Or we could use data (generated from the pitch spec) to plot a circle (or an oval due to the coordinates)

[Torvaney]

or could just use ggforce 🤷‍♂

[Torvaney]

another false alarm :/