Fixed log ip sanitizer

[dimaush]

Раз уж по условию разрешены ведущие нули, то исправил тест, в котором из-за такого же ведущего нуля IP-адрес почему-то не признавался, а также исправил эталонное решение.

[vtm9]

Allowing arbitrary leading zeros is a valid fix, but the new regex consumes invalid four-octet candidates and then skips valid addresses beginning inside them.

Reproduction: solution("999.1.2.3.4") currently returns "999.[REDACTED]"; this PR returns "999.1.2.3.4". The address 1.2.3.4 is valid and bounded by a dot and the string end, as the description permits. "256.001.002.003.004" has the same regression.

Please preserve scanning for valid addresses after a rejected candidate, while keeping leading-zero support, and add both regression cases. All 30 existing asserts pass, so additional coverage is needed.