Historically, the net-type parameter was an integer,
it's now a string with the network family name.

References:

• https://github.com/eggheads/eggdrop/commit/050c4a820751c63ad51d9a4cec04965b76fd82a1
• https://github.com/eggheads/eggdrop/commit/722f29f0f9f845cc8d5c8e7fdbc22557c6ca790a

Fixes T2326.