fix(isTaxID): reduce pl-PL and lv-LV check digit modulo 10

[gaoflow]

plPlCheck (PESEL) and lvLvCheck compare a raw modulus result against a single digit without reducing it back into 0–9, so on the boundary residue the predicate demands a check digit of 10 and none of the ten digits can satisfy it. Every valid PESEL and every valid pre-2017 Latvian personal code whose check digit is 0 is rejected — about 10% and 9% of those two ID spaces.

validator.isTaxID('02070800090', 'pl-PL'); // false <- valid PESEL
validator.isTaxID('01011000010', 'lv-LV'); // false <- valid personas kods
// and so are all nine other check digits for those two bodies

The fix is the same % 10 reduction #1529 applied to elGrCheck. I checked the rest of the file for the same boundary: bg-BG, dk-DK, es-AR, et-EE, pt-BR, pt-PT, ro-RO, uk-UA and the ISO 7064 helper already map the out-of-range residue back to a digit, and hu-HU, nl-NL and sl-SI reject it because those numbers genuinely are not issued — these two were the only ones missing it. The new fixtures cover each century branch of both functions and fail without the src/ change; npm test passes with it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (cca32d6) to head (95f8acc).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2827   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          114       114           
  Lines         2600      2600           
  Branches       659       659           
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  Hits          2600      2600           

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