Part upgrades in ExoticAlloys node blocked by oreTankUpgrade partIcon

[eminterrupted]

I noticed that I was not seeing any of the upgrades that were supposed to be available in the Exotic Alloys node, such as the 5M composite tanks or the Ore Tank upgrades. After troubleshooting, it seems like it is due to the partIcon specified for oreTankUpgrade. Currently it points to 'MediumOreTank' but I don't have that part in my (heavily modded) install. It seems like that part is only available when the Missing History mod is installed. I manually changed the partIcon value to 'SmallTank' which is the stock 1.25m ore tank, after which all of the other upgrades requiring Exotic Alloys showed up. Happy to create a pull request with the change that unblocked me if that would be helpful.

[hemeac]

No need for a PR on this, is easy enough to fix. Thanks for flagging