Rename 60-layer initial state for EC60to30wISC

[xylar]

One more fix not picked up in #502

[xylar]

@mark-petersen, okay my testing is far enough that I'm reasonably sure this is working and can be merged now. (I'm in day 15 of a 20-day spin-up of EC60to30wISC.)

[mark-petersen]

I'll test in a fresh directory this time - that's what caused my last 'false positive'. I'll copy over the base_mesh and culled_mesh to save time.

[xylar]

No need to test spin-up like I did but make sure ssh_adjustment gets through at least one iteration.

[mark-petersen]

merged locally, merge commit 433cce8. Passes nightly regression suite with gnu/opt and intel/debug. Also tested 64-layer with QU240wISC.

@xylar, I ran EC60to30wISC through ssh adjustment and spin-up. Verified that pits are gone.

[mark-petersen]

On merge commit 433cce8, here is the 60 layer EC60to30wISC:

@xylar I ran it all the way through spin-up here:

/lustre/scratch4/turquoise/mpeterse/runs/200402_EC60to30wISC/ocean/global_ocean/EC60to30wISC

Feel free to use that or redo it.