[bugfix] Komega and LowReKepsilon typetags for the ransnc tests were switched
In the RANS NC tests, the typetag set in the CMake lists was switched for the lowrekepsilon and komega tests.
This is corrected here in the CMakeLists, and the name of the reference file is switched.
In addition, the function turbulence model to string is reordered to match the order in the turbulence model enum.