Simplify calls to vista prf container

[JWinawer]

Right now there are many levels of complexity, using different githutb repos and docker, singularity, matlab etc. We would like to get something relatively simple that points to a BIDS directory and a json file with input arguments.

[JWinawer]

Currently, s4_vistaPRF.sh will fail on the cluster because it calls a docker container, which cannot run on the cluster. Moreover, we found recently that the vista pRF code is simpler and cleaner to call from the Matlab command line rather than using a container.

So... Let's just remove the calls to the containers.