update to 3-branch grid mfds

active-crust/grid/mfd-map-all.json

active-crust/grid/mfd-map.json

subduction/slab/gmm-tree-v1.json

subduction/slab/interface/gk/adaptive/rate-tree.json

subduction/slab/interface/gk/fixed/rate-tree.json

subduction/slab/interface/nn/adaptive/rate-tree.json

subduction/slab/interface/nn/fixed/rate-tree.json

subduction/slab/interface/r85/adaptive/rate-tree.json

subduction/slab/interface/r85/fixed/rate-tree.json

subduction/slab/mfd-map.json

subduction/slab/slab/gk/adaptive/rate-tree.json

subduction/slab/slab/gk/fixed/rate-tree.json

subduction/slab/slab/nn/adaptive/rate-tree.json

subduction/slab/slab/nn/fixed/rate-tree.json

subduction/slab/slab/r85/adaptive/rate-tree.json

subduction/slab/slab/r85/fixed/rate-tree.json