Removed deprecated YAML parameters from hydro test cases.

examples/CoolingBox/coolingBox.yml

examples/CoolingHalo/cooling_halo.yml

examples/CoolingHaloWithSpin/cooling_halo.yml

examples/CosmoVolume/cosmoVolume.yml

examples/EAGLE_100/eagle_100.yml

examples/EAGLE_12/eagle_12.yml

examples/EAGLE_25/eagle_25.yml

examples/EAGLE_50/eagle_50.yml

examples/EAGLE_6/eagle_6.yml

examples/ExternalPointMass/externalPointMass.yml

examples/Gradients/gradientsCartesian.yml

examples/Gradients/gradientsRandom.yml

examples/Gradients/gradientsStretched.yml

examples/GreshoVortex_2D/gresho.yml

examples/HydrostaticHalo/hydrostatic.yml

examples/KelvinHelmholtz_2D/kelvinHelmholtz.yml

examples/MultiTypes/multiTypes.yml

examples/Noh_1D/noh.yml

examples/Noh_2D/noh.yml

examples/Noh_3D/noh.yml