increase MPOL of VMEC input by one so that DESC eq has requisite reso…

[dpanici]

…lution to capture shafranov shift

without this increase, the auto continuation solve from the command line yields an equilibrium with barely any shafranov shift

Things to check

• [ ] If the continuation method steps are weird or have changed
• [ ] if it is indeed the MPOL thing (MPOL to MPOL-1 upon loading VMEC was changed about 2 years ago, but 6 months ago we lowered the resolution from 12 to 8... so worth checking the code at that point)