Amend wrapper_funpack to match README

Presently generate_inital_data/ directs the user to set env var NONIDPDATA with a path to UKB csv files with tabular data. However, there are no references to $NONIDPDATA anywhere in the code, yet there is a $input1 in that is asking to be set to what is $NONIDPDATA.

This impliments that change.

Edited by Tom Nichols

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