`no_cooling_limit` branch merge bug

Looks like the merge of the no_cooling_limit branch (fcaf6987) introduced a bug where the initial temperature of the Universe in cosmological cases is wrong.

Reproduction steps:

Download master
Compile with any SPH (I used minimal)
Run SmallCosmoVolume/SmallCosmoVolume_hydro for one step
Look at the temperature output
This is not the same as the initial temperature specified in the .yml file.

No time to look into this right now so documenting here. I bisected between the master head and v0.8.1 to isolate this.

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