Set "ConnectionPadding 1" by default to unify padding behavior for Tor Browser users

Netflow padding was implemented by Mike Perry and merged for Tor 0.3.1.x, however by default it is only enabled with relays that have version bigger or equal to 0.3.1.x.

https://www.torproject.org/docs/tor-manual.html.en#ConnectionPadding

As a result, since Tor version distribution for guard nodes is significantly different it means that some Tor Browser users will have different network fingerprint.

Of course even if they have it's not really that harmful but enabling it by default may not prove harmful either.