All three refueling missions share a common task type and differentiate
their behavior based on the type and allegiance of the package target.
This means that if the theater commander identifies a carrier as the
best location for a theater refueling task, a recovery tanker will be
planned by mistake.
If this happens on a sunken carrier, mission generation will fail
because a recovery tanker cannot be generated for a sunken carrier.
Fix the crash and the misplanned theater tanker by preventing the
commander from choosing fleet control points as refueling targets.
Fixes https://github.com/dcs-liberation/dcs_liberation/issues/2693.
