Pau Riera

Commit ID: https://github.com/gridap/GridapMakie.jl/commit/da571c5f100b714cc8a4bad908c54d6e33b97d06 The first bug refers to "3D_Fig1.png" [here](https://github.com/gridap/GridapMakie.jl/blob/da571c5f100b714cc8a4bad908c54d6e33b97d06/test/runtests.jl#L92), where some boundary edges are not drawn:  See here that the lines from (1,0,1) to (1,1,1) and (1,1,1) to...