[1.6.7] Upgrade targeting defaults to mecharachnid

[slowclapman]

When clicking the upgrade ability, the range targeter will always try to select your mecharachnid by default despite the fact that you cannot actually upgrade it
and even when other valid targets are around. I suppose it is "classifed" as a turret somehow?

This is stretching the definition of bug but there is no good reason it should be this way so thought I'd report it anway

All bugs and minor inconveniences must be ANNIHILATED.