fix(mohaa): open the GameSpy query port (#5172)
The dedicated server only starts its GameSpy query socket if g_gametype
is set when the first map loads. +map ran before +exec of the server
cfg, so g_gametype was still 0 and the socket on 12300 never opened.
Exec the server cfg before +map, add queryport (net_gamespy_port,
default 12300), query it with gamedig protocol-gamespy1, and show the
query port in details.