[Rseding91] [2.0.12] Heating tower can fast-replace Nuclear reactor

[ManaUser]

And vice versa.

To reproduce, simply place a Heating tower or Nuclear reactor and then try to build the other on top of it, unexpectedly you can.

While they do obviously bear some similarity, it doesn't seem like this should occur considering they're not even the same size.

[Rseding91]

Thanks for the report. This is now fixed for the next release.