Revert gridsearch vertex workaround

[caiw]

#127 introduced the following workaround

          in particular, `gridsearch/plain.py'

            hexels=channel_names[1,:10239], # TODO: HACK - FIX WITH ISSUE #141
            data_lh=log_pvalues_lh[:10239,], # TODO: HACK - FIX WITH ISSUE #141
            data_rh=log_pvalues_rh[:10239,], # TODO: HACK - FIX WITH ISSUE #141

Should be something like:

            hexels=[channel_names[:len(log_pvalues_lh)], len(log_pvalues_lh):],
            data_lh=log_pvalues_lh,
            data_rh=log_pvalues_rh,

_Originally posted by @neukym in https://github.com/kymata-atlas/kymata-toolbox/issues/141#issuecomment-1912923978_
            

This should be reverted once #141 is done