observer+overlord detection range upgrades

[m0ebiuz]

observers and overlords normally have

• 9 sight range
• 9 detection range

and upgrade to

• 11 sight range
• 11 detection range

todo: not sure how to best make the matching changes to parasite

[abrahamYG]

Good catch! Wroks like a charm, I would like to eventualyl review if we should inherit from the base detectors, but thats a topic for another day.