[warn] tor_bug_occurred_(): Bug: src/feature/relay/dns.c:1424: configure_libevent_options: Non-fatal assertion !(!the_evdns_base) failed

Reported by toralf on IRC #tor-relays

Seems that we can get called configuring libevent DNS options before the DNS subsystem is initialized due to a consensus arriving.

Thus, we should just simply remove the BUG().

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