tokamak_from_plasma using vertical build based on outboard radial build causes clashes

[tokasamwin]

The approach used to generate the vertical build from the radial build causes clashes on the inboard side if the outboard build is larger than the inboard.

The cause is that the vertical build is based on the outboard radial build, as the inboard shapes go from the inboard build at inboard radius, equatorial to outboard build at vertical, often increasing in thickness along the inboard side. Switching this to the inboard radial build prevents this issue, and is also more appropriate to blanket thicknesses/space allocation, as both inboard and upper/lower regions have lower flux than the outboard build.

[shimwell]

Many thanks for spotting this and reporting and making a PR. Much appreciated.