fix: require both control digits for 12-digit INN#475
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Nested ternary precedence skipped the first control when both were <=9, so invalid numbers like 000000000018 were accepted. Compare both checks via % 10.
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validators.i18n.ru.ru_inn hits false-accept when 12-digit INN ternary precedence skips first control digit when both controls <=9. This PR fixes the regression with a focused test covering the case.