Fix HQ rules in nod03a and nod03b.

Fixes a bug reported in the website comments:

> There's a bug in missions "sudanese prison break". you can build a comm center but you can't sell it. however you can sell any other building.

The `HQ.NOAIRSTRIKE` definitions did not inherit from the building default, and so they were missing some of the default traits.  This building duplication is no longer necessary, so I have changed this back to using the default HQ with overrides to disable the airstrike.