Reuse recnum and other variables between registers in fake data

[lwjohnst86]

We need to reuse the same vector of recnums in both the lpr_adm + lpr_diag tables (and, similarly, reuse an dw_ek_kontakt vector for both LPR3 tables), similar to how the pnrs are the same in all the tables. Otherwise joining the tables using recnum/dw_ek_kontakt as the joining key is going to be messy.

Originally posted by @Aastedet in #70 (comment)