A Few Small Fixes — Surviving Ceres Steam update #1372896

There was a rare issue where the Hub could be placed low enough that colliders could overlap the landscape, making it impossible to place some structures. There was a rare issue where landing pads would stay in use after you launched a rocket. I just wanted to push these couple of small fixes to address some minor issues. I am currently working on the first big update, but I had to get this out for players. I hope to have the first major update ready for June, but if you want to stay up-to-date, consider joining the Discord. Thank you, and have fun terraforming.