swap lines to fix missing inherited methods

[EyePulp]

Fix a transposed pair of lines in plugins/dnswl.js

    plugin.load_dnswl_ini();
    plugin.inherits('dns_list_base');

plugin.load_dnswl_ini() attempts to use inherited methods, which aren't yet present. A line swap fixes it.

[msimerson]

Mmmm, I see the problem. load_dnswl_ini() isn't an inherited function, it's actually in dnswl.js, but I'll merge this (b/c I think inheritance should come first) and fix the problem you're seeing in another PR.

[EyePulp]

I could have phrased it better - there's a conditional call inside load_dnswl_ini() that does call on the inherited check_zones() function here:
https://github.com/haraka/Haraka/blob/master/plugins/dnswl.js#L39-L41

[msimerson]

Ahhhh, right you are. Good catch.