Brh - update confounders.jl for non-UKBB cohort

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (0c4657c) 95.65% compared to head (ab9f1dc) 95.72%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #176 +/- ## ========================================== + Coverage 95.65% 95.72% +0.07% ========================================== Files 5 5 Lines 345 351 +6 ========================================== + Hits 330 336 +6 Misses 15 15 ``` | [Files](https://app.codecov.io/gh/TARGENE/TargeneCore.jl/pull/176?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TARGENE) | Coverage Δ | | |---|---|---| | [src/confounders.jl](https://app.codecov.io/gh/TARGENE/TargeneCore.jl/pull/176?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=TARGENE#diff-c3JjL2NvbmZvdW5kZXJzLmps) | `100.00% <100.00%> (ø)` | |

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[olivierlabayle]

@roskamsh I have added the optionality of the ld-block file. If you are happy with it we can merge now and I cn show you how the release is done.