Halve the cost of the short Mk2 tanks

[CaptRobau]

The long and short Mk2 tanks (both LFO and Liquid Fuel variants) both cost the same in the VAB/SPH: 750. Even though the short one is half the long one's length. Every other fuel tank has the shorter one be cheaper as well. As such I suggest halving the Mk2 short fuel tanks' cost, so from 750 to 375.

[Red Iron Crown]

I don't play much career so I hardly notice part costs, but I just checked and you're absolutely right. That definitely seems like an oversight that should be fixed.