[Fix] if the patch is of mesh type, still use patch first

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] m2t_acidtest: added \usepgfplotslibrary{patchplots}

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>