Update output variables section in TH2M prj files

Tests/Data/TH2M/H2/dissolution_diffusion/bourgeat.prj

Tests/Data/TH2M/H2M/OrthotropicSwelling/square.prj

...M/HM/Confined_Compression/HM_confined_compression_gas.prj

...M/Confined_Compression/HM_confined_compression_liquid.prj

Tests/Data/TH2M/HM/flow_fully_saturated.prj

Tests/Data/TH2M/HM/flow_fully_saturated_gas.prj

Tests/Data/TH2M/TH/idealGasLaw/compression_gas.prj

Tests/Data/TH2M/TH2/heatpipe/heat_pipe_rough.prj

Tests/Data/TH2M/TH2/heatpipe/heat_pipe_strict.prj

Tests/Data/TH2M/TH2/unicube/unicube.prj

...THM/Confined_Compression/THM_confined_compression_gas.prj

.../Confined_Compression/THM_confined_compression_liquid.prj