change ClientUseIPv6 to 1
Relates to #40785 (closed).
Currently, the Tor client default to never use IPv6. This is bad, as it lets the tor client fail to connect entirely on IPv6-only connections.
A better default would be enabling IPv4 and IPv6 so that endpoints that fail to connect can be skipped. And for connections to the entry/guard node, it is also irrelevant for privacy and security reasons anyway.