Added per #1382 port settings to default generated webadmin.ini file

Made simple modifications to WebAdmin.h and WebAdmin.cpp so that ipv4 and ipv6 port settings would be generated and included in the default generated webadmin.ini file.  Included ipv6 port for completeness.

CoderDawg (akaTealFrog on forum)
This code won't compile, it isn't C++. If you want to provide a default, you need to do so in the class's constructor.
Also, setting both ports to the same value doesn't work on Linux.