Fix compiler warning.

network.c:63:2: warning: missing braces around initializer [-Wmissing-braces]
network.c:63:2: warning: (near initialization for 'ip4_any.ip.__u6_addr') [-Wmissing-braces]
forward alternate_nick to Irc::Server attributes

add the missing alternate_nick in Irc::Server by making an additional
call to the Irc::Connect filler. this is not quite ideal but might
need bigger refactoring otherwise.