Update obfsvpn firewall port range

The hopping PT uses a range of tcp ports, so we need to just open that
range.

config/roles/bridge/files/50obfsvpn.firewall

-allow_port tcp 443
-allow_port udp 443
+allow_port tcp 443 # Normal non-hopping obfsvpn
+add_rule -I base-input -p tcp --match multiport --dports 49152:65535 -j ACCEPT # Port range for hopping