fix: honor -resolvers with -scan-all-ips (#976)

[dogancanbakir]

Fixes #976. -resolvers was applied to the fastdialer but not to the standalone dnsx client used by the -scan-all-ips / -ip-version resolution path, so queries fell back to the dnsx default pool (1.1.1.1, 8.8.4.4, …).

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