Change dummy address for snowflake

This will prevent a bug where tor skips bandwidth events for local
addresses (see https://bugs.torproject.org/33693)

client/torrc

@@ -7,4 +7,4 @@ ClientTransportPlugin snowflake exec ./client \
 -ice stun:stun.l.google.com:19302 \
 -max 3
 
-Bridge snowflake 0.0.3.0:1
+Bridge snowflake 192.0.2.3:1

client/torrc-localhost

@@ -5,4 +5,4 @@ ClientTransportPlugin snowflake exec ./client \
 -url http://localhost:8080/ \
 -keep-local-addresses
 
-Bridge snowflake 0.0.3.0:1
+Bridge snowflake 192.0.2.3:1