Fix bug with column position

[evgeniy-r]

Fix for #68

✓ Checklist:

• This PR has been added to CHANGELOG.md (at the top of the list);
• Tests for the changes have been added (for bug fixes / features).

[codecov-commenter]

Codecov Report

Merging #69 (a617383) into main (f744ee8) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   75.86%   75.88%   +0.02%     
==========================================
  Files          41       41              
  Lines        2279     2281       +2     
==========================================
+ Hits         1729     1731       +2     
  Misses        550      550              

Impacted Files	Coverage Δ
datanymizer_dumper/src/postgres/table.rs	87.58% <100.00%> (+0.08%)	⬆️

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